#include <stdio.h>
#define LMax 10000010

const char IN[]="text.in",OUT[]="text.out";
char s[LMax];

int main()
{
	int i , number=0 , digits=0 ;
	freopen(IN,"r",stdin);
	fgets( s , LMax , stdin);
	fclose(stdin);
	
	for (i=0;s[i];++i)
	{
		if ( s[i]>='a' && s[i]<='z' || s[i]>='A' && s[i]<='Z' )
		{
			++digits;++number;++i;
			while ( s[i]>='a' && s[i]<='z' || s[i]>='A' && s[i]<='Z' )
				++digits,++i;
		}
	}
	
	freopen(OUT,"w",stdout);
	printf("%d\n",digits/number);
	fclose(stdout);
	return 0;
}