#include<fstream>
#include<cstdio>
#include<cstring>
using namespace std;
FILE *f;
ofstream g("text.out");
int i,n,nrl,nrcuv;
char s[10000001];
int main()
{f=fopen("text.in","r");
fgets(s,10000000,f);
n=strlen(s);
i=0;
while((s[i]>'z'||s[i]<'a')&&(s[i]>'Z'&&s[i]<'A'))
	++i;
for(i=i;i<=n;++i)
{if(s[i]>='a'&&s[i]<='z' ||s[i]>='A'&&s[i]<='Z')
	nrl++;
else
	if(s[i-1]>='a'&&s[i-1]<='z'||s[i-1]>='A'&&s[i-1]<='Z')
		++nrcuv;
}
g<<nrl/nrcuv;
fclose(f);
g.close();
return 0;
}