import std.stdio, std.conv, std.functional, std.string; import std.algorithm, std.array, std.container, std.range, std.typecons; import std.bigint, std.numeric, std.math, std.random; import core.bitop; string FMT_F = "%.10f"; static File _f; void file_io(string fn) { _f = File(fn, "r"); } static string[] s_rd; T _RD(T = long)() { while(!s_rd.length) s_rd = readln.chomp.split; string res = s_rd[0]; s_rd.popFront; return res.to!T; } T _RD(T = long)(File f) { while(!s_rd.length) s_rd = f.readln.chomp.split; string res = s_rd[0]; s_rd.popFront; return res.to!T; } T[] _RDA(T = long)(T fix = 0) { auto r = readln.chomp.split.to!(T[]); r[] += fix; return r; } T[] _RDA(T = long)(File f, T fix = 0) { auto r = f.readln.chomp.split.to!(T[]); r[] += fix; return r; } T RD(T = long)() { if (_f.isOpen) return _RD!T(_f); else return _RD!T; } T[] RDA(T = long)(T fix = 0) { if (_f.isOpen) return _RDA!T(_f, fix); else return _RDA!T(fix); } size_t[] MAKE_IDX(alias less = "a < b", Range)(Range range) { auto idx = new size_t[](range.length); makeIndex!(less)(range, idx); return idx;} size_t MIN_POS(alias less = "a < b", Range)(Range range) { auto r = minPos!(less)(range); return range.length - r.length; } void chmin(T)(ref T x, T y) { x = min(x, y); } void chmax(T)(ref T x, T y) { x = max(x, y); } bool inside(T)(T x, T b, T e) { return x >= b && x < e; } T lcm(T)(T x, T y) { return x * (y / gcd(x, y)); } double[] rotate(double[] vec, double rad) { return [cos(rad)*vec[0] - sin(rad)*vec[1], sin(rad)*vec[0] + cos(rad)*vec[1]]; } //long mod = 10^^9 + 7; long mod = 998_244_353; //long mod = 1_000_003; void moda(ref long x, long y) { x = (x + y) % mod; } void mods(ref long x, long y) { x = ((x + mod) - (y % mod)) % mod; } void modm(ref long x, long y) { x = (x * y) % mod; } void modpow(ref long x, long y) { if (!y) { x = 1; return; } auto t = x; x.modpow(y>>1); x.modm(x); if (y&1) x.modm(t); } void modd(ref long x, long y) { y.modpow(mod - 2); x.modm(y); } void main() { auto M = RD; auto A = RDA; auto B = RDA; auto d = new long[](M); foreach (i; 0..M) { d[i] = B[i] - A[i]; } long[] k; char[] c; long ll, rr = M-1; foreach (i; 0..M) { if (d[i] > 0) break; foreach (_; 0..d[i].abs) { k ~= i+1; c ~= 'L'; } ++ll; } foreach_reverse (i; 0..M) { if (d[i] < 0) break; foreach (_; 0..d[i].abs) { k ~= i+1; c ~= 'R'; } --rr; } debug writeln(k); debug writeln(c); long i = ll; while (i < rr) { if (i < ll) { i = ll; continue; } if (d[i].sgn != d[i+1].sgn) { foreach_reverse (j; ll..i+1) { foreach (_; 0..d[j].abs) { k ~= j+1; c ~= 'R'; } } ll = rr+1; foreach (j; i+1..rr+1) { if (d[j] > 0) { ll = j; break; } foreach (_; 0..d[j].abs) { k ~= j+1; c ~= 'L'; } } debug writeln("i:", i, " ", k, c); } ++i; } writeln(k.length); foreach (j; 0..k.length) { writeln(k[j], " ", c[j]); } stdout.flush; debug readln; }