#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main(){
    char name[100];
    if (fgets(name, sizeof(name),stdin) == NULL){
        printf("Invalid input\n");
        return 0;
    }
    name[strcspn(name, "\n")] = '\0';
    if (strlen(name) == 0){
        printf("Invalid input\n");
        return 0;
    }
    for (int i = 0; name[i] != '\0'; i++){
        if (isdigit((unsigned char)name[i]))) {
            printf("Invalid input\n");
            return 0;
        }
    }
    int len = strlen(name);
    for(int j = 0; j < i; j++){
        printf("%c", name[j]);
        if(j != i - 1){
            printf(" ");
        }
    }
    printf("\n");
    return 0;
}