#include <stdio.h>

int main() {
   char c = ' ';
   char w_max[2000]; // max word
   char w_temp[2000]; // temp word

   for (int i = 0; i < 2000; ++i) {
      /* '\0' => end of line */
      w_max[i] = '\0';
      w_temp[i] = '\0';
   }

   int max_len = 0; // max word's length
   int t_len = 0; // temp word's length
   int index = 0;
   while (c != '\n') {
      scanf("%c", &c);
      if (c >= 'a' && c <= 'z') { // ['a';'z']
         t_len += 1;
         w_temp[index] = c; index++; // 'a' -> 0, 'b' -> 1
      } else {
         if (max_len < t_len) {
            max_len = t_len;
            for (int i = 0; i < max_len; ++i) w_max[i] = w_temp[i];
         }
         for (int i = 0; i < t_len; ++i) {
            printf("%c", w_temp[i]);
         }
         printf("\n"); // new line
         index = 0;
         t_len = 0;
         for (int i = 0; i < 2000; ++i) {
            w_temp[i] = '\0';
         }
      }
   }

   printf("\n");
   for (int i = 0; i < max_len; ++i) {
      printf("%c", w_max[i]);
   }

   return 0;
}