#include <stdio.h>
#include <string.h>

int main(){
    FILE *f1,*f2;
    f1=fopen("text.in","r");
    f2=fopen("text.out","w");
    long nr,l,i;
    char s[525000];
    fscanf(f1,"%s",s);
    for (i=0;i<strlen(s);i++){
        if ('a'<=s[i]<='z'){l++;}
    }
    fclose(f1);
    fclose(f2);
    return 0;
}