#include <stdio.h>

char c;
int nr,cont;

int main()
{
    int fol;
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    c=fgetc(stdin);
    while(! (c>='A' && c<='Z') || (c>='a' && c<='z') )
        c=fgetc(stdin);
    while(!feof(stdin))
        {
            if( (c>='A' && c<='Z') || (c>='a' && c<='z') )
                {
                    ++nr;
                    fol=0;
                }
            else
                if(fol==0)
                    {
                        ++cont;
                        fol=1;
                    }
            c=fgetc(stdin);
	}
    if(fol==0)
    	++cont;
    printf("%d",nr/cont);
    return 0;           
}