新手易学

#include <bits/stdc++.h>
using namespace std;
int a[1000000];
char b[]={'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'};
int main(){
string s;
cin>>s;
for (int i=0;i<s.size();i++){
for (int j=0;j<26;j++){
if (s[i]==b[j]){
a[j];
}
}
}
for (int j=0;j<26;j){
if (a[j]>0){
cout<<b[j]<<":"<<a[j]<<endl;
}
}
}