#include<stdio.h>
#include<ctype.h>
int main(){
    char s[105];int w=0,i;
    fgets(s,100,stdin)
        for(i=0;s[i];i++){
            if(!isalpha(s[i])&&s[i]!=' ') return printf("Invalid input"),0;
            if(isalpha(s[i])&&(i==0||s[i-i]==' ')) w++;
            
        }
    }
    printf("%d",w);
    return 0;
}