#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define INF 1LL<<62
#define inf 1000000007
string s[22];
int main() {
ll n,l;
cin>>n>>l;
cin.ignore();
for(ll i=0;i<=l;i++){
getline(cin,s[i]);
}
ll ans=0;
for(ll i=0;i<2*n-1;i++){
if(s[l][i]=='o'){
ans=i;
}
}
//cout <<ans;
for(ll i=l-1;i>=0;i--){
for(ll j=0;j<2*n-1;j++){
if(s[i][j]=='-'){
if(j==ans-1){
ans-=2;
}
else if(j==ans+1){
ans+=2;
}
}
}
}
cout << 1+ans/2<<endl;
// your code goes here
return 0;
}
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