#include <iostream>
#include <vector>
using namespace std;
bool zad1(int a, int b, int c){
vector <int> cyfrya;
while(a > 0){
int cy = a%10;
cyfrya.push_back(cy);
a /= 10;
}
vector <int> cyfryb;
while(b > 0){
int cy = b%10;
cyfrya.push_back(cy);
b /= 10;
}
int suma = 0;
for(int i = 0; i < cyfrya.size(); i++){
suma += cyfrya[i];
}
for(int i = 0; i < cyfryb.size(); i++){
suma += cyfryb[i];
}
if(suma == c){
return true;
}else{
return false;
}
}
int main() {
int a, b, c;
cin >> a >> b >> c;
if(zad1(a, b, c))cout << "df";
return 0;
}
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