#include<stdio.h>
int s,cuv,lit;
char ca,c;
int main(){

	FILE*f=fopen("text.in","r");
	FILE*g=fopen("text.out","w");
	
	fscanf(f,"%c",&ca);
		if(ca>='A'&&c<='Z')
			ca+=32;
			
		if(ca>='a'&&c<='z')
			lit++;
			
	while(fscanf(f,"%c",&c)!=EOF){
		if(c>='A'&&c<='Z')
			c+=32;
			
		if(c>='a'&&c<='z')
			lit++;
		 
		 if((c<'a'||c>'z')&&(ca>='a'&&ca<='z'))
			cuv++;
		
		 ca=c;
		}
		
	
		
	if(c>='a'&&c<='z')
		cuv++;

	s=lit/cuv;
	
	fprintf(g,"%d",s);








fclose(f);
fclose(g);

	return 0;
}