#include <stdio.h>
#include <ctype.h>

int main()
{
    int nr,nrcuv;
    char c,c1;
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    c=getchar();
    c1=0;
    nr=0;
    nrcuv=0;
    while(c!='\n' && c!=EOF)
    {
        if(isalpha(c))
            nr++;
        if(isalpha(c1) && !isalpha(c))
            nrcuv++;
        c1=c;
        c=getchar();
    }
    if(isalpha(c1) && !isalpha(c))
        nrcuv++;
    printf("%d\n",nr/nrcuv);

    return 0;
}