#include <cstdio>
#include <cstring>
#include <cctype>
using namespace std;
FILE *f,*g;
char *p,s[1000010];
int m,cuv,lit;
int main()
{
    f=fopen("text.in","r");
    g=fopen("text.out","w");
    fgets(s+1,1000010,f);
    p=s+1;
    s[0]=' ';
    while(*p&&!isalnum(*p))
        p++;
    while(*p)
    {
        if(isalnum(*p))lit++;
        if(!isalnum(*p)&&isalnum(*(p-1)))
            cuv++;
        p++;
    }
    fprintf(g,"%d\n",m);
    return 0;
}