#include<stdio.h>
int cuv,nr;
char c,ca;
int main() {
	FILE*f=fopen("text.in","r");
	FILE*g=fopen("text.out","w");
	fscanf(f,"%c",&ca);
	if(ca>='A' && ca<='Z')
		ca+=32;
	if(ca>='a'&&ca<='z')
		nr++;
	while(fscanf(f,"%c",&c)!=EOF){
		if(c>='A' && c<='Z')
		c+=32;
		if(c>='a'&&c<='z')
		nr++;
		if((c<'a'||c>'z')&&(ca>='a'&&ca<='z'))
			cuv++;
		ca=c;
		
	}
	if(c>='a'&&c<='z')
		cuv++;
	fprintf(g,"%d",nr/cuv);
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	
	fclose(f);
	fclose(g);
	return 0;
}