#include <stdio.h>
#include <string.h>

using namespace std;

char S[1000005];
int LEN,NRLIT,NRCUV;

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

    fgets(S,1000005,stdin);
    LEN=strlen(S);
    int i;
    for (i=0;i<LEN;i++)
    {
        if ((S[i]>='a' && S[i]<='z') || (S[i]>='A' && S[i]<='Z'))
            NRLIT++;
        if (S[i]==' ' || S[i]=='\n' || S[i]=='.' || S[i]=='!' || S[i]=='?' || S[i]==',')
            NRCUV++;
    }

    printf("%d\n",NRLIT/NRCUV);

    fclose(stdin);
    fclose(stdout);
    return 0;
}