#include <stdio.h>
using namespace std;

int main(void)
{char c;
 int nr=0,lg=0;
 FILE *fin=fopen("text.in","r");
 FILE *fout=fopen("text.out","w");
 while(!feof(fin))
	{c=fgetc(fin);
	 if((c>='A' && c<='Z') || (c>='a' && c<='z'))
		{while((c>='A' && c<='Z') || (c>='a' && c<='z'))
			{lg++; c=fgetc(fin);		}
		 nr++;
		}
	}
 fprintf(fout,"%d",lg/nr);
 fclose(fin); fclose(fout);
 return 0;
}