import std.stdio, std.array, std.string, std.conv, std.algorithm; import std.typecons, std.range, std.random, std.math, std.container; import std.numeric, std.bigint, core.bitop, core.stdc.stdio; void main() { auto s = readln.split; auto N = s[0].to!int; auto X = s[1].to!long; auto A = readln.split.map!(to!long).array; int[][long] dp; foreach (i; 0..N) { foreach (k; dp.keys) { if (A[i]+k <= X && !(A[i]+k in dp)) dp[A[i]+k] = (dp[k] ~ i); } if (A[i] <= X && !(A[i] in dp)) dp[A[i]] = [i]; } string ans = ""; if (X in dp) { foreach (i; 0..N) { ans ~= (find(dp[X], i).empty) ? "x" : "o"; } } else { ans = "NO"; } ans.writeln; }