#include <stdio.h>
#include <string.h>
#include <ctype.h>
int main (){
    int n;
    scanf("%d",&n);
    char name[n][30];
    int tail=0;
    for(int i=0;i<n;i++){
        scanf("%s",name[tail];
        for(int j=0;j<strlen(name[tail])){
            if(isalnum(name[tail][j])){
                printf("invalid input\n");
                return 0;
            }
        }
        tail++;
 }
for(int i=0;<tail;i++){
    printf("%s",name[i]);
    if(i!=tail-1){
        printf(" ");
    }
}
return 0;