#53876: 吸 PLUS PLUS CODE參考
hch980506@gmail.com
(申有娜我老婆)
#include <iostream>
using namespace std;
int main() {
string input;
cin >> input;
int sizeOFinput = input.size();
if (sizeOFinput >= 4) {
cout << input;
} else {
cout << input[0];
while (sizeOFinput < 4) {
cout << '0';
sizeOFinput++;
}
for (int i = 1; i < input.size(); i++) {
cout << input[i];
}
}
}