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

int main(void) {
    char a[101];
    char read[8];
    char goal[8] = "treeone";
    char *input = "forest";
    
    char *p;
    
    scanf("%s", a);
    
    for (int i = 0; i < 100; i++) {
        p = strstr(a, goal);
        
        do {
            *(p++) = *(input);
        }  while(*(input++) != '\0');
        
        *(p + 7) = '\0';
    }
    
    return 0;
}