#include <cstdio>
#include <cstring>
#include <cctype>
using namespace std;

int TotalLen, CntWords, CurrentLen;
char C;

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

    while(scanf("%c", &C) == 1)
    {
        if(isupper(C) || islower(C)) CurrentLen ++;
        else
        {
            if(CurrentLen) TotalLen += CurrentLen, CntWords ++;
            CurrentLen = 0;
        }
    }

    if(CurrentLen) TotalLen += CurrentLen, CntWords ++;

    printf("%i\n", TotalLen / CntWords);
}