#include <stdio.h>
#include <string.h>

#define COLS    50
#define ROWS    6

int main(void)
{
    char cities[ROWS][COLS];
    int i = 0, bigger_size = 0, var_count = 0; 
    
    while(scanf("%49s", cities[i]) == 1 && i < ROWS){
        if (strlen(cities[i]) > bigger_size){
            bigger_size = strlen(cities[i]);
            var_count = i;
        }
        i++;
    }
    
    printf("%s", cities[var_count]);
    
    return 0;
}