#include <fstream>
#include <cstring>

using namespace std;
ifstream f ("text.in");
ofstream g ("text.out");
char x[100000];
int cuv,nr,ok,i;
int main()
{   ok=0;f.getline(x,100000);i=0;
while(i<strlen(x))
{if (strchr("qazwsxedcrfvtgbyhnujmiklopQAZWSXEDCRFVTGBHYNMJUIKLOP",x[i])!=0&&ok==0)
{nr++;ok=1;cuv++;}
else
if (strchr("qazwsxedcrfvtgbyhnujmiklopQAZWSXEDCRFVTGBHYNMJUIKLOP",x[i])!=0&&ok==1)
{nr++;}
else{
ok=0;}
i++;}
    g<<nr/cuv<<'\n';
    return 0;
}