#include<stdio.h>
#include<ctype.h>
int main()
{
    char a[100];
    fgets(a,sizeof(a),stdin);
    if(a!=isalpha)
    {
        printf("Invalid input");
    }
    else if(isalpha(a))
    {
     pop(repeated isalpha(a));   
    }
    else
    {
        printf("%s",a);
    }
}