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


int main(int argc, const char * argv[]) {
    FILE *in = fopen("input.txt", "r");

    char c;
    char zbor[1000];
    int i = 0;
    while(fscanf(in, "%c", &c) != EOF) {

        if(isalpha(c)) {
            zbor[i] = c;
            i++;
        }
        else {

            if(isupper(zbor[0])) {
                int dali_se_mali = 1;
                for(int j = 1; j < i; j++) {
                    if(isupper(zbor[j])) {
                        dali_se_mali = 0;
                    }
                }
                if(dali_se_mali == 1) {
                    for(int j = 0; j < i; j++){
                        printf("%c", zbor[j]);
                    }
                    printf("\n");
                }
            }
            i = 0;
        }
    }
    return 0;

}