STLmap

#include<bits/stdc++.h>
using namespace std;
int main(){
    string s; cin >> s;
    map<char,int> mp;
    for(int i = 0;i < s.size();i++) mp[s[i]]++;
    for(auto i : mp) cout << i.first << " = " << i.second << endl;
    return 0;
}