#include <stdio.h>
#include <string>
#define MAXN 1300000

char c,r;
long nr,h;

int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);

    while(scanf("%c", &c)!=EOF)
    {
          if ( ( ( (c >= 'a') && (c <= 'z') ) || ( (c >= 'A') && (c <= 'Z') ) )) ++h;
          else if ( ( ( (r >= 'a') && (r <= 'z') ) || ( (r >= 'A') && (r <= 'Z') ) )) ++nr; 
          r=c;
    }
    
    printf("%ld\n",h/nr);
    
    return 0;    
}