#include <iostream>
using namespace std;
int main() {
// Introduc variabilele a, b, c şi x;
int a, b, c, x;
// Citesc a, b, c, x;
cin >> a >> b >> c >> x;
// Introduc variabila “cnt” sa numar cifrele;
int cnt = 0;
// parcurg x;
//Introduc o variabila “rest”
int rest;
while (x > 0) {
++cnt;
if (cnt != 1 && x % 10 != c)
cout <<"NU";
else if (x < 10 && x != b && cnt != x) {
cout <<"NU";
}else{
cout <<"DA";
}
x /= 10;
}
// Daca “cnt” egal cu 1 si daca rest egal cu b;
//Daca “cnt” egal cu a si rest egal cu c;
//Afisez DA daca e diferit, afisez NU;
return 0;
}
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