#include <iostream>
using namespace std;
int main() {
long long int n, min = 0, max = 1000000001, answer = 0, max_amount_of_0 = 0, without0;
cin >> n;
for(int i = 0; i < n; i++){
long long int num, alsonum, count = 0, number;
cin >> num;
alsonum = num;
while(alsonum > 0){
if(alsonum % 10 == 0){
count++;
alsonum /= 10;
}
else{
without0 = alsonum < max ? alsonum:without0;
alsonum = -1; //останока while
max = without0;
//cout << without0 << ' ';
}
}
//cout << without0 << ' ';
if(count!=0){
if(count > max_amount_of_0){
answer = num;
number = num;
max_amount_of_0 = count;
}
else if(count == max_amount_of_0){
//cout << num << ' ';
answer = answer < num? answer:num;
}
//cout << max_amount_of_0 << ' ';
//cout << min << ' ';
//cout << num << ' ';
}
//cout << num << ' ';
//cout << answer << ' ';
}
if(answer==0) cout << without0;
else cout << answer;
}
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