#include<iostream>
#include<stdio.h>
#include<cstdlib>
using namespace std;
int main()
{
long int i,k,n,sp=0,min=25,space[12],r;
//freopen("in.txt","r",stdin);
char ch,c;
while(cin>>n&&n)
{
r=0;
scanf("%c",&c);//skipping new line after getting n;
for(i=0;i<n;)
{
scanf("%c",&ch);
if(ch=='X')continue;
if(ch==' ')
sp++;
else
{
if(sp<min)min=sp;
space[i++]=sp;
sp=0;
}
}
for(k=0;k<i;k++)
r+=space[k]-min;
cout<<r<<endl;
min=25;
}
exit(0);
}
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