#include <bits/stdc++.h> using namespace std ; #define is == #define isnt != #define wnsl '\n' #define ll long long const ll sec = 4557430888798830399 ; #define dbg(...) cerr << "(", dbg_out (#__VA_ARGS__, __VA_ARGS__) ; template <typename... Args> void print_args (Args... args) { ((cout << args << " "), ...) ; cout << wnsl ; } void dbg_out () { cerr << ")" << wnsl ; } template <typename Head, typename... Tail> void dbg_out(const char* names, Head H, Tail... T) { const char* comma = strchr (names, ',') ; if (!comma) comma = names + strlen(names) ; cerr.write (names, comma - names) << " = " << H ; if constexpr (sizeof...(T) > 0) { cerr << ", " ; dbg_out( comma + 1, T...) ; } else dbg_out () ; } void Solve () { ll n, m ; cin >> n >> m ; ll a [n + 1], b [m + 1] ; for (int i = 1 ; i <= n ; i ++) cin >> a [i] ; for (int i = 1 ; i <= m ; i ++) cin >> b [i] ; ll l = 0, r = sec ; while (l < r) { ll mid = l + (r - l) / 2 ; ll p = 1 ; for (int i = 1 ; i <= n ; i ++) { if (p <= m and b [p] > a [i] + mid) { continue ; } if (p <= m and b [p] < a [i] - mid) { continue ; } if (p <= m and b [p] < a [i]) { while (p <= m and b [p] <= a [i]) p ++ ; } else if (p <= m and b [p] >= a [i]) { while (p <= m and b [p] - a [i] <= mid) p ++ ; } } if (p > m) r = mid ; else l = mid + 1 ; } if (r is sec) { cout << -1 << wnsl ; return ; } else { cout << r << wnsl ; ll p = 1 ; srand (time (nullptr)) ; for (int i = 1 ; i <= n ; i ++) { if (p > m) { cout << (rand () % 2 is 1 ? 'L' : 'R') ; continue ; } if (b [p] < a [i]) { cout << 'L' ; while (p <= m and b [p] <= a [i]) p ++ ; } else { cout << 'R' ; while (p <= m and b [p] - a [i] <= r) p ++ ; } } cout << wnsl ; } } int main () { ios_base::sync_with_stdio (false) ; cin.tie (nullptr) ; cout.tie (nullptr) ; Solve () ; }