tj

#include<bits/stdc++.h>
using namespace std;
int main(){
    string s;
    cin>>s;
    int a[26] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
    for(int i = 0;i<s.size();i++){
        a[s[i]-'a']++;
    }
    for(int i = 0;i<26;i++){
        if(a[i]!=0)
            cout<<char(i+'a')<<':'<<a[i]<<endl;
    }
}