#include <iostream>
#include <string>
using namespace std;

int main() {
    string a1;
    getline(cin, a1);

    
    size_t sum = a1.rfind(" ");

   
    cout << a1.size() - sum - 1 << endl;

    return 0;
}

用getline防止碰到“ ” 就结束，rfind 从后往前找