题解 | #序列求和#

#include <iostream>

using namespace std;

int main() {
    int sum = 0;
    string s;
    
    cin >> s;
    
    for(int i = 0; i < s.length(); i++) {
        sum += s[i] - '0';
    }
    
    cout << sum << endl;
    
    return 0;
}