#include <iostream> #include <string> using namespace std; int main() { string s; while (cin >> s&&s != "0") { int n=0; for (auto a : s) n += a - '0'; int sum = 0; while (sum >= 10 || sum == 0) { sum = 0; while (n > 0) { sum += n % 10; n /= 10; } n = sum; } cout << sum << endl; } return 0; }
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