#include <iostream> #include <string> using namespace std; int main() { string str; cin >> str; int count[26] = {0}; for (char c : str) { if (c >= 'a' && c <= 'z') { count[c - 'a']++; } } // 找出最大出现次数 int maxCount = 0; for (int i = 0; i < 26; i++) { if (count[i] > maxCount) { maxCount = count[i]; } } for (int i = 0; i < 26; i++) { if (count[i] == maxCount) { cout << "'" << char('a' + i) << "' "; } } cout << maxCount ; return 0; }