#include <iostream>
using namespace std;
int main() {
long int n, k, count, maxamount, min = 0, a, minmin, p;
long int num = 100000000000, answer = 100000000000, withoutO = 10000000000;
cin>> p;
while(cin >> n){
int k = n;
count = 0;
while(k>0){
if(k%10==0){
count++;
k/=10;
}
else{
withoutO = n < withoutO? n:withoutO;
k = -1;
}
}
if( count > 0 ){
maxamount = count >= min? count : min;
min = maxamount;
}
if( maxamount == count ){
if( n < maxamount){
answer = n;
}
else{
answer = answer > n? n:answer;
}
}
//cout << maxamount << ' ';
a = answer;
if( a < 10000000000 ) withoutO = 0;
}
if(withoutO != 0){
cout<< withoutO;
}
else{
cout << a << endl;
}
}
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