题解

#include <iostream>
#include <string>
using namespace std;
int main() {
string s;
cin >> s;
int count[26] = {0};
for (char c : s) {
count[c - 'a'];
}for (int i = 0; i < 26; i) {
if (count[i] > 0) {
cout << (char)(i + 'a') << ':' << count[i] << '\n';
}
}
return 0;
}