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#include <bits/stdc++.h>
using namespace std;
int main()
{
int q;cin>>q;
int l=1,r=0,i;
int arr[200009];
while(q--)
{
char c; cin>>c>>i;
if(c=='L') {l--;arr[i]=l;}
else if(c=='R') {r++;arr[i]=r;}
else {printf("%d\n",min(arr[i]-l,r-arr[i]));}
}
return 0;
}
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