#include <iostream>
using namespace std;
int main() {
long long int n, x, minim = 10;
cin >> n >> x;
while (n != 0) {
int c = n % 10;
n = n / 10;
if (c < minim && c > x)
minim = c;
} if (minim == 10)
cout << -1;
else cout << minim;
return 0;
}
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