#include <iostream>#include <string>using namespace std;int main() { int len, maxlen; string s, ss; maxlen = 0; do { cin >> ss; len = ss.length(); if (ss[0] == '#') break; if (len > maxlen) { s = ss; maxlen = len; } } while (true); cout << s << endl; return 0;}输入： I am a citizen of China #
输出：_________