//:字符串中最长单词
#include <stdio.h>

int main(){
    char array[100], c;
    int word = 0, max = 0;
    int i, cnt = 0, flag;

    gets(array);

    for(i=0; (c=array[i])!=''; i++){
        if(' '==c){
            word = 0;
        }else if(0==word){
            word = 1;
            cnt = 1;
        }else if(1==word){
            ++cnt;
            if(cnt>max){  //记录最长单词长度
                max = cnt;
                flag = i;  //记住最长单词结束位置
            }
        }
    }//for

    for(i=flag-max+1; i<=flag; i++){
        printf("%c", array[i]);
    }
    printf("n");
    return 0;
}