#include <bits/stdc++.h>
#define int long long
using namespace std;
signed main() {
ios_base::sync_with_stdio(0); cin.tie(0);
int n, m;
cin >> n >> m;
int x;
cin >> x;
vector<int> a(m);
for (int i = 0; i < m; i++) {
cin >> a[i];
a[i] -= x;
}
if (a[0] < 0 && a[m - 1] > 0) {
cout << "-1\n";
}
if (a[0] < 0) {
cout << -a[0] << "\nL\n";
} else if (a[m - 1] < 0) {
cout << -a[m - 1] << "\nL\n";
} else {
cout << a[m - 1] << "\nR\n";
}
}
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