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

char x,y;

int m,n,cuv,lit;

int muu(int &lit)
{
	scanf("%c",&x);
	if(x>='A'&&x<='Z')||(x>='a'&&x<='z')
	{
		lit++;
	}
	while(scanf("%c",&y)!=EOF)
	{
		if( (y>='A'&&y<='Z')||(y>='a'&&y<='z') )
		{
			lit++;
			if( (x<'A')||(x>'Z'&&x<'a')||(x>'z'))
				cuv++;
		}
		x=y;
	}
    return cuv;
}


int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
   	
	int n = muu(m);
    printf("%d",m/n);

	return 0;
}