#include<stdio.h>
#include<string.h>
char c[255],b[255],a[255];
int max=-1;
int main()
{
	gets(c);
	int len=strlen(c);
	for(int i=0;i<len;i++)
	{
		if(c[i]!=' ')
		{
		int count=0;
		for(;i<len&&c[i]!=' ';i++)
		b[++count]=c[i];
		if(count>max)	
		{
		for(int j=1;j<=count;j++)
		a[j]=b[j];
		max=count;
		}
		}
	}
	for(int i=1;i<=max;i++)
	printf("%c",a[i]);
	return 0;
}
/**************************************************************
	Problem: 1107
	User: admin
	Language: C
	Result: Accepted
	Time:10 ms
	Memory:1036 kb
****************************************************************/