C++ :

#include<bits/stdc++.h>
using namespace std;
int main(){
	char s[300];
	int i,c=0;
	gets(s);
	for(i=0;i<strlen(s);i++){
		c++;
		if(s[i]=='.'){
			break;
		}
		if(i==strlen(s)||s[i]!=s[i+1]){
			cout<<s[i]<<':'<<c<<' ';
			c=0;
		}
	}
}

Java :

import java.util.Scanner;

public class Main{
	public static void putChar(int[] a,char c) {
		a[(int)c - 97]++;
	}
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		int[] a = new int[26];
		for(int i=0;i<s.length()-1;i++ ){
			char c = s.charAt(i);
			putChar(a,c);
		}
		int c = 0;
		for(int i=0;i<26;i++) {
			if(a[i] != 0) {
				System.out.print((char)(i+97) + ":" + a[i] + " ");
				c++;
			}
			if(c % 5 == 0) {
				System.out.println();
			}
		}
	}
}	

Python :

s1=input()
n=0
for i in range(97,97+27):
    n=s1.count(chr(i))
    if n>0:
        print("{}:{}".format(chr(i),n),end=" ")