#include <stdio.h>
FILE*f=fopen("text.in","r");
FILE*g=fopen("text.out","w");
char x,z;
int n,nr;
int main() {
	while(fscanf(f,"%c",&x)!=EOF){
		if(('a'<=x&&x<='z')||('A'<=x&&'Z'>=x))
			n++;
		else
			if(('a'<=z&&z<='z')||('A'<=z&&'Z'>=z))
				nr++;
		z=x;
	}
	fprintf(g,"%d",n/nr);
	
	
	
	fclose(g);
	fclose(f);
	return 0;
}