#include<cstdio>
#include<cstring>
using namespace std;
bool isalpha(char a)
{
	if(a>='a'&&a<='z'||a>='A'&&a<='Z')
		return 1;
	return 0;
}
int main()
{
	FILE*iFile=fopen("text.in","r"),*oFile=fopen("text.out","w");
	char s;int i,s1=0,s2=0;bool k=1;
	while(!feof(iFile))
	{
		fscanf(iFile,"%c",&s);
		if(isalpha(s))
			s1++;
		else
			k=1;
		if(isalpha(s)&&k)
		{
			s2++;k=0;
		}
	}
	fprintf(oFile,"%i",s1/s2);
}