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