//Andrew Berneshawi

#include<iostream>
#include<fstream>
using namespace std;

int main()
{
	ifstream fin("data2.txt");
	ofstream fout("out2.txt");

	long int num; 
	int i=0, dig, great=0;

	for (; i<5; i++)
	{
		fin>>num;

		for (great=0; num>=1; num/=10)
		{
			dig=num%10;
			if (dig>great)
				great=dig;
		}
		fout<<great<<endl;
	}

	return 0;
}