import java.io.*;

class Main {
    public static void main (String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String str;
        StringBuilder sb = new StringBuilder();
        char[] charArr;
        char c;
        int count;
        while ((str = br.readLine()) != null) {
            try {
                sb.append(str.toCharArray());
            } catch (Exception e) {
                break;
            }
            
        }
        charArr = sb.toString().toCharArray();
        for (c = 'a'; c <= 'z'; c++) {
            count = 0;
            for (char x : charArr) {
                if (x == c || x == Character.toUpperCase(c)) {
                    count++;
                }
            }
            System.out.println(c + " : " + count);
        }
    }
} import java.io.*; io.* java class Main {
    public static void main (String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String str;
        StringBuilder sb = new StringBuilder();
        char[] charArr;
        char c;
        int count;
        while ((str = br.readLine()) != null) {
            try {
                sb.append(str.toCharArray());
            } catch (Exception e) {
                break;
            }
            
        }
        charArr = sb.toString().toCharArray();
        for (c = 'a'; c <= 'z'; c++) {
            count = 0;
            for (char x : charArr) {
                if (x == c || x == Character.toUpperCase(c)) {
                    count++;
                }
            }
            System.out.println(c + " : " + count);
        }
    }
} Main public static void main (String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String str;
        StringBuilder sb = new StringBuilder();
        char[] charArr;
        char c;
        int count;
        while ((str = br.readLine()) != null) {
            try {
                sb.append(str.toCharArray());
            } catch (Exception e) {
                break;
            }
            
        }
        charArr = sb.toString().toCharArray();
        for (c = 'a'; c <= 'z'; c++) {
            count = 0;
            for (char x : charArr) {
                if (x == c || x == Character.toUpperCase(c)) {
                    count++;
                }
            }
            System.out.println(c + " : " + count);
        }
    } main {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String str;
        StringBuilder sb = new StringBuilder();
        char[] charArr;
        char c;
        int count;
        while ((str = br.readLine()) != null) {
            try {
                sb.append(str.toCharArray());
            } catch (Exception e) {
                break;
            }
            
        }
        charArr = sb.toString().toCharArray();
        for (c = 'a'; c <= 'z'; c++) {
            count = 0;
            for (char x : charArr) {
                if (x == c || x == Character.toUpperCase(c)) {
                    count++;
                }
            }
            System.out.println(c + " : " + count);
        }
    } BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); br new BufferedReader(new InputStreamReader(System.in)) String str; str StringBuilder sb = new StringBuilder(); sb new StringBuilder() char[] charArr; charArr char c; c int count; count while ((str = br.readLine()) != null) {
            try {
                sb.append(str.toCharArray());
            } catch (Exception e) {
                break;
            }
            
        } (str = br.readLine()) != null (str = br.readLine()) str br.readLine() br.readLine br null {
            try {
                sb.append(str.toCharArray());
            } catch (Exception e) {
                break;
            }
            
        } try {
                sb.append(str.toCharArray());
            } catch (Exception e) {
                break;
            } catch (Exception e) {
                break;
            } Exception e {
                break;
            } break; {
                sb.append(str.toCharArray());
            } sb.append(str.toCharArray()) sb.append sb str.toCharArray() str.toCharArray str charArr = sb.toString().toCharArray() charArr sb.toString().toCharArray() sb.toString().toCharArray sb.toString() sb.toString sb for (c = 'a'; c <= 'z'; c++) {
            count = 0;
            for (char x : charArr) {
                if (x == c || x == Character.toUpperCase(c)) {
                    count++;
                }
            }
            System.out.println(c + " : " + count);
        } c = 'a'; c = 'a' c 'a' c <= 'z' c 'z' c++ c++ c {
            count = 0;
            for (char x : charArr) {
                if (x == c || x == Character.toUpperCase(c)) {
                    count++;
                }
            }
            System.out.println(c + " : " + count);
        } {
            count = 0;
            for (char x : charArr) {
                if (x == c || x == Character.toUpperCase(c)) {
                    count++;
                }
            }
            System.out.println(c + " : " + count);
        } count = 0 count 0 for (char x : charArr) {
                if (x == c || x == Character.toUpperCase(c)) {
                    count++;
                }
            } char x charArr {
                if (x == c || x == Character.toUpperCase(c)) {
                    count++;
                }
            } {
                if (x == c || x == Character.toUpperCase(c)) {
                    count++;
                }
            } if (x == c || x == Character.toUpperCase(c)) {
                    count++;
                } x == c || x == Character.toUpperCase(c) x == c x c x == Character.toUpperCase(c) x Character.toUpperCase(c) Character.toUpperCase Character c {
                    count++;
                } count++ count System.out.println(c + " : " + count) System.out.println System.out System System.out c + " : " + count c + " : " + count c " : " count String[] args args
import java.io.*;

class Main {
    public static void main (String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String str;
        StringBuilder sb = new StringBuilder();
        char[] charArr;
        char c;
        int count;
        while ((str = br.readLine()) != null) {
            try {
                sb.append(str.toCharArray());
            } catch (Exception e) {
                break;
            }
            
        }
        charArr = sb.toString().toCharArray();
        for (c = 'a'; c <= 'z'; c++) {
            count = 0;
            for (char x : charArr) {
                if (x == c || x == Character.toUpperCase(c)) {
                    count++;
                }
            }
            System.out.println(c + " : " + count);
        }
    }
}