Untitled

#include <iostream>
using namespace std;

int count(int a, int i = 0)
{
	while (a)
	{
		a /= 10;
		i++;
	}
	return i;
}
int main()
{
	int a, n, max = 0;
	cin >> n;
	while (n)
	{
		cin >> a;
		if (count(a) > max) max = a;
		n--;
	}
	cout << max;
}