#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define pb push_back
#define sz size
#define mp make_pair
#define ios ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define fre(s) freopen(s".in", "r", stdin);freopen(s".out", "w", stdout);
#define ss second
#define f first
#define ii pair<ll,ll>
#define pii pair<int,int>
const int N=3e6+7;
const ll inf=2e12+7;
const ll mod=1e9+7;
ll f[N],un;
int n,q,a,m,b;
int main()
{
ios
string s;
cin>>n>>s;
ll R=0,K=0;
for(int i=0;i<n;++i)
{
if(s[i]=='R')R++;
else K++;
}
string x="",y="";
if(abs(R-K)>1)
{
cout<<-1;
return 0;
}
cout<<1;
}
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