import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
//		List<Integer> x =new ArrayList<Integer>();
		String str=new String();
		int[] a = new int[26];
		String[] eng = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n"
				      ,"o","p","q","r","s","t","u","v","w","x","y","z"};
		do{
			str = scan.next();
			for(int i=0;i<str.length() ;i++){
				for(int j = 0 ; j < eng.length ;j++ ){
					if( eng[j].equalsIgnoreCase(String.valueOf(str.charAt(i)))){
						a[j]++;
					}
				}

			}
		}while(scan.hasNext());


		
		for(int j = 0 ; j < eng.length ;j++ ){
			System.out.println(eng[j]+" : "+a[j]);
			}

	}
}







//
//import java.util.ArrayList;
//import java.util.List;
//import java.util.Scanner;
//
//public class Main {
//	public static void main(String[] args) {
//		Scanner scan = new Scanner(System.in);
//		List<Integer> n = new ArrayList<Integer>();
//		List<Integer> x = new ArrayList<Integer>();
//		List<Integer> count = new ArrayList<Integer>();
//
//		 for(int i=0;;i++){
//			 n.add(i, scan.nextInt());
//			 x.add(i, scan.nextInt());
//			 count.add(i, 0);
//			 if(n.get(i)==0 && x.get(i)==0) break;
//		 }
//
//
//
//   for(int h=0;;h++){
//		 if(n.get(h)==0 && x.get(h)==0) break;
//		 for(int i=1;i<=n.get(h);i++){
//			 for(int j=i;j<=n.get(h);j++){
//				 if(i==j)continue;
//				 for(int k=j;k <= n.get(h);k++){
//					 if(i==k || j==k)continue;
//					 if(i+j+k == x.get(h)) count.set(h, count.get(h)+1 );
//				 }
//			 }
//		 }
//
//			System.out.println(count.get(h));
//   }
//	}
//
//}
//
// import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
//		List<Integer> x =new ArrayList<Integer>();
		String str=new String();
		int[] a = new int[26];
		String[] eng = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n"
				      ,"o","p","q","r","s","t","u","v","w","x","y","z"};
		do{
			str = scan.next();
			for(int i=0;i<str.length() ;i++){
				for(int j = 0 ; j < eng.length ;j++ ){
					if( eng[j].equalsIgnoreCase(String.valueOf(str.charAt(i)))){
						a[j]++;
					}
				}

			}
		}while(scan.hasNext());


		
		for(int j = 0 ; j < eng.length ;j++ ){
			System.out.println(eng[j]+" : "+a[j]);
			}

	}
} Main public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
//		List<Integer> x =new ArrayList<Integer>();
		String str=new String();
		int[] a = new int[26];
		String[] eng = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n"
				      ,"o","p","q","r","s","t","u","v","w","x","y","z"};
		do{
			str = scan.next();
			for(int i=0;i<str.length() ;i++){
				for(int j = 0 ; j < eng.length ;j++ ){
					if( eng[j].equalsIgnoreCase(String.valueOf(str.charAt(i)))){
						a[j]++;
					}
				}

			}
		}while(scan.hasNext());


		
		for(int j = 0 ; j < eng.length ;j++ ){
			System.out.println(eng[j]+" : "+a[j]);
			}

	} main {
		Scanner scan = new Scanner(System.in);
//		List<Integer> x =new ArrayList<Integer>();
		String str=new String();
		int[] a = new int[26];
		String[] eng = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n"
				      ,"o","p","q","r","s","t","u","v","w","x","y","z"};
		do{
			str = scan.next();
			for(int i=0;i<str.length() ;i++){
				for(int j = 0 ; j < eng.length ;j++ ){
					if( eng[j].equalsIgnoreCase(String.valueOf(str.charAt(i)))){
						a[j]++;
					}
				}

			}
		}while(scan.hasNext());


		
		for(int j = 0 ; j < eng.length ;j++ ){
			System.out.println(eng[j]+" : "+a[j]);
			}

	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) String str=new String(); str new String() int[] a = new int[26]; a new int[26] 26 String[] eng = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n"
				      ,"o","p","q","r","s","t","u","v","w","x","y","z"}; eng {"a","b","c","d","e","f","g","h","i","j","k","l","m","n"
				      ,"o","p","q","r","s","t","u","v","w","x","y","z"} "a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m" "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z" do{
			str = scan.next();
			for(int i=0;i<str.length() ;i++){
				for(int j = 0 ; j < eng.length ;j++ ){
					if( eng[j].equalsIgnoreCase(String.valueOf(str.charAt(i)))){
						a[j]++;
					}
				}

			}
		}while(scan.hasNext()); scan.hasNext() scan.hasNext scan {
			str = scan.next();
			for(int i=0;i<str.length() ;i++){
				for(int j = 0 ; j < eng.length ;j++ ){
					if( eng[j].equalsIgnoreCase(String.valueOf(str.charAt(i)))){
						a[j]++;
					}
				}

			}
		} str = scan.next() str scan.next() scan.next scan for(int i=0;i<str.length() ;i++){
				for(int j = 0 ; j < eng.length ;j++ ){
					if( eng[j].equalsIgnoreCase(String.valueOf(str.charAt(i)))){
						a[j]++;
					}
				}

			} int i=0; int i=0; i 0 i<str.length() i str.length() str.length str i++ i++ i {
				for(int j = 0 ; j < eng.length ;j++ ){
					if( eng[j].equalsIgnoreCase(String.valueOf(str.charAt(i)))){
						a[j]++;
					}
				}

			} {
				for(int j = 0 ; j < eng.length ;j++ ){
					if( eng[j].equalsIgnoreCase(String.valueOf(str.charAt(i)))){
						a[j]++;
					}
				}

			} for(int j = 0 ; j < eng.length ;j++ ){
					if( eng[j].equalsIgnoreCase(String.valueOf(str.charAt(i)))){
						a[j]++;
					}
				} int j = 0 ; int j = 0 ; j 0 j < eng.length j eng.length eng eng.length j++ j++ j {
					if( eng[j].equalsIgnoreCase(String.valueOf(str.charAt(i)))){
						a[j]++;
					}
				} {
					if( eng[j].equalsIgnoreCase(String.valueOf(str.charAt(i)))){
						a[j]++;
					}
				} if( eng[j].equalsIgnoreCase(String.valueOf(str.charAt(i)))){
						a[j]++;
					} eng[j].equalsIgnoreCase(String.valueOf(str.charAt(i))) eng[j].equalsIgnoreCase eng[j] eng j String.valueOf(str.charAt(i)) String.valueOf String str.charAt(i) str.charAt str i {
						a[j]++;
					} a[j]++ a[j] a j for(int j = 0 ; j < eng.length ;j++ ){
			System.out.println(eng[j]+" : "+a[j]);
			} int j = 0 ; int j = 0 ; j 0 j < eng.length j eng.length eng eng.length j++ j++ j {
			System.out.println(eng[j]+" : "+a[j]);
			} {
			System.out.println(eng[j]+" : "+a[j]);
			} System.out.println(eng[j]+" : "+a[j]) System.out.println System.out System System.out eng[j]+" : "+a[j] eng[j]+" : "+a[j] eng[j] eng j " : " a[j] a j String[] args args public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
//		List<Integer> x =new ArrayList<Integer>();
		String str=new String();
		int[] a = new int[26];
		String[] eng = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n"
				      ,"o","p","q","r","s","t","u","v","w","x","y","z"};
		do{
			str = scan.next();
			for(int i=0;i<str.length() ;i++){
				for(int j = 0 ; j < eng.length ;j++ ){
					if( eng[j].equalsIgnoreCase(String.valueOf(str.charAt(i)))){
						a[j]++;
					}
				}

			}
		}while(scan.hasNext());


		
		for(int j = 0 ; j < eng.length ;j++ ){
			System.out.println(eng[j]+" : "+a[j]);
			}

	}
} public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
//		List<Integer> x =new ArrayList<Integer>();
		String str=new String();
		int[] a = new int[26];
		String[] eng = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n"
				      ,"o","p","q","r","s","t","u","v","w","x","y","z"};
		do{
			str = scan.next();
			for(int i=0;i<str.length() ;i++){
				for(int j = 0 ; j < eng.length ;j++ ){
					if( eng[j].equalsIgnoreCase(String.valueOf(str.charAt(i)))){
						a[j]++;
					}
				}

			}
		}while(scan.hasNext());


		
		for(int j = 0 ; j < eng.length ;j++ ){
			System.out.println(eng[j]+" : "+a[j]);
			}

	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
//		List<Integer> x =new ArrayList<Integer>();
		String str=new String();
		int[] a = new int[26];
		String[] eng = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n"
				      ,"o","p","q","r","s","t","u","v","w","x","y","z"};
		do{
			str = scan.next();
			for(int i=0;i<str.length() ;i++){
				for(int j = 0 ; j < eng.length ;j++ ){
					if( eng[j].equalsIgnoreCase(String.valueOf(str.charAt(i)))){
						a[j]++;
					}
				}

			}
		}while(scan.hasNext());


		
		for(int j = 0 ; j < eng.length ;j++ ){
			System.out.println(eng[j]+" : "+a[j]);
			}

	}
}







//
//import java.util.ArrayList;
//import java.util.List;
//import java.util.Scanner;
//
//public class Main {
//	public static void main(String[] args) {
//		Scanner scan = new Scanner(System.in);
//		List<Integer> n = new ArrayList<Integer>();
//		List<Integer> x = new ArrayList<Integer>();
//		List<Integer> count = new ArrayList<Integer>();
//
//		 for(int i=0;;i++){
//			 n.add(i, scan.nextInt());
//			 x.add(i, scan.nextInt());
//			 count.add(i, 0);
//			 if(n.get(i)==0 && x.get(i)==0) break;
//		 }
//
//
//
//   for(int h=0;;h++){
//		 if(n.get(h)==0 && x.get(h)==0) break;
//		 for(int i=1;i<=n.get(h);i++){
//			 for(int j=i;j<=n.get(h);j++){
//				 if(i==j)continue;
//				 for(int k=j;k <= n.get(h);k++){
//					 if(i==k || j==k)continue;
//					 if(i+j+k == x.get(h)) count.set(h, count.get(h)+1 );
//				 }
//			 }
//		 }
//
//			System.out.println(count.get(h));
//   }
//	}
//
//}
//
//