#include<cstdio>
#include<cstring>

//int sep=" /-"


void cit(int &k, int &l)
{
	char x;
	k=0;l=0;
	scanf("%c",&x);
	while(x>=122 || (x<=97&&x>=90) || x<=65)
		scanf("%c",&x);
	while(!feof(stdin))
	{
		if( (97<=int(x)&&int(x)<=122) || (65<=int(x)&&int(x)<=90))
			++l;
		else
			++k;
		scanf("%c",&x);
	}
}

void afis(int k, int l)
{
	printf("%d",l/k);
}



int main()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	
	int k,l;
	
	
	cit(k,l);
	afis(k,l);
}