import java.util.Scanner;
public class Main {
	
	static char[] k = {'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'};
	

	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		String s = "";
		while(stdIn.hasNext()) {
		s += stdIn.nextLine();
		}
		s = s.toLowerCase();
		int[] ans = new int[k.length];
		for(int i = 0; i < s.length(); i++) {
			for(int j = 0; j < k.length; j++) {
				if(s.charAt(i) == k[j]) {
					ans[j]++;
				}
			}
		}
		
		for(int i = 0; i < 26; i++) {
			System.out.println(k[i]+" : " + ans[i]);
		}
	}
} import java.util.Scanner; Scanner java.util public class Main {
	
	static char[] k = {'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'};
	

	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		String s = "";
		while(stdIn.hasNext()) {
		s += stdIn.nextLine();
		}
		s = s.toLowerCase();
		int[] ans = new int[k.length];
		for(int i = 0; i < s.length(); i++) {
			for(int j = 0; j < k.length; j++) {
				if(s.charAt(i) == k[j]) {
					ans[j]++;
				}
			}
		}
		
		for(int i = 0; i < 26; i++) {
			System.out.println(k[i]+" : " + ans[i]);
		}
	}
} Main static char[] k = {'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'}; k {'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' public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		String s = "";
		while(stdIn.hasNext()) {
		s += stdIn.nextLine();
		}
		s = s.toLowerCase();
		int[] ans = new int[k.length];
		for(int i = 0; i < s.length(); i++) {
			for(int j = 0; j < k.length; j++) {
				if(s.charAt(i) == k[j]) {
					ans[j]++;
				}
			}
		}
		
		for(int i = 0; i < 26; i++) {
			System.out.println(k[i]+" : " + ans[i]);
		}
	} main {
		Scanner stdIn = new Scanner(System.in);
		String s = "";
		while(stdIn.hasNext()) {
		s += stdIn.nextLine();
		}
		s = s.toLowerCase();
		int[] ans = new int[k.length];
		for(int i = 0; i < s.length(); i++) {
			for(int j = 0; j < k.length; j++) {
				if(s.charAt(i) == k[j]) {
					ans[j]++;
				}
			}
		}
		
		for(int i = 0; i < 26; i++) {
			System.out.println(k[i]+" : " + ans[i]);
		}
	} Scanner stdIn = new Scanner(System.in); stdIn new Scanner(System.in) String s = ""; s "" while(stdIn.hasNext()) {
		s += stdIn.nextLine();
		} stdIn.hasNext() stdIn.hasNext stdIn {
		s += stdIn.nextLine();
		} s += stdIn.nextLine() s stdIn.nextLine() stdIn.nextLine stdIn s = s.toLowerCase() s s.toLowerCase() s.toLowerCase s int[] ans = new int[k.length]; ans new int[k.length] k.length k k.length for(int i = 0; i < s.length(); i++) {
			for(int j = 0; j < k.length; j++) {
				if(s.charAt(i) == k[j]) {
					ans[j]++;
				}
			}
		} int i = 0; int i = 0; i 0 i < s.length() i s.length() s.length s i++ i++ i {
			for(int j = 0; j < k.length; j++) {
				if(s.charAt(i) == k[j]) {
					ans[j]++;
				}
			}
		} {
			for(int j = 0; j < k.length; j++) {
				if(s.charAt(i) == k[j]) {
					ans[j]++;
				}
			}
		} for(int j = 0; j < k.length; j++) {
				if(s.charAt(i) == k[j]) {
					ans[j]++;
				}
			} int j = 0; int j = 0; j 0 j < k.length j k.length k k.length j++ j++ j {
				if(s.charAt(i) == k[j]) {
					ans[j]++;
				}
			} {
				if(s.charAt(i) == k[j]) {
					ans[j]++;
				}
			} if(s.charAt(i) == k[j]) {
					ans[j]++;
				} s.charAt(i) == k[j] s.charAt(i) s.charAt s i k[j] k j {
					ans[j]++;
				} ans[j]++ ans[j] ans j for(int i = 0; i < 26; i++) {
			System.out.println(k[i]+" : " + ans[i]);
		} int i = 0; int i = 0; i 0 i < 26 i 26 i++ i++ i {
			System.out.println(k[i]+" : " + ans[i]);
		} {
			System.out.println(k[i]+" : " + ans[i]);
		} System.out.println(k[i]+" : " + ans[i]) System.out.println System.out System System.out k[i]+" : " + ans[i] k[i]+" : " + ans[i] k[i] k i " : " ans[i] ans i String[] args args public class Main {
	
	static char[] k = {'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'};
	

	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		String s = "";
		while(stdIn.hasNext()) {
		s += stdIn.nextLine();
		}
		s = s.toLowerCase();
		int[] ans = new int[k.length];
		for(int i = 0; i < s.length(); i++) {
			for(int j = 0; j < k.length; j++) {
				if(s.charAt(i) == k[j]) {
					ans[j]++;
				}
			}
		}
		
		for(int i = 0; i < 26; i++) {
			System.out.println(k[i]+" : " + ans[i]);
		}
	}
} public class Main {
	
	static char[] k = {'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'};
	

	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		String s = "";
		while(stdIn.hasNext()) {
		s += stdIn.nextLine();
		}
		s = s.toLowerCase();
		int[] ans = new int[k.length];
		for(int i = 0; i < s.length(); i++) {
			for(int j = 0; j < k.length; j++) {
				if(s.charAt(i) == k[j]) {
					ans[j]++;
				}
			}
		}
		
		for(int i = 0; i < 26; i++) {
			System.out.println(k[i]+" : " + ans[i]);
		}
	}
} Main
import java.util.Scanner;
public class Main {
	
	static char[] k = {'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'};
	

	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		String s = "";
		while(stdIn.hasNext()) {
		s += stdIn.nextLine();
		}
		s = s.toLowerCase();
		int[] ans = new int[k.length];
		for(int i = 0; i < s.length(); i++) {
			for(int j = 0; j < k.length; j++) {
				if(s.charAt(i) == k[j]) {
					ans[j]++;
				}
			}
		}
		
		for(int i = 0; i < 26; i++) {
			System.out.println(k[i]+" : " + ans[i]);
		}
	}
}