#include <iostream>#include <cstdio>#include <cstring>#include <algorithm>#include <cmath>using namespace std;#define INF 0x7ffffff#define MAXN 110#define eps 1e-7#define ghs 1.7320508075struct line{ int num; double x[3],y[3];}p[27];bool judge(line & q){ double ans = (q.x[0] - q.x[1]) * (q.x[0] - q.x[1]) + (q.y[0] - q.y[1]) * (q.y[0] - q.y[1]); for(int i = 1; i < 3; i++){ if(fabs(ans - ((q.x[i] - q.x[(i+1)%3]) * (q.x[i] - q.x[(i+1)%3]) + (q.y[i] - q.y[(i+1)%3]) * (q.y[i] - q.y[(i+1)%3]))) > eps)return 0; } return 1;}int main(){ int n,i,j; double t, a, b; char c; while(scanf("%d",&n),n){ for(i = 0; i < 27; i++){ p[i].num = 0; } a = 10000.0; b = 10000.0; getchar(); for(i = 1; i <= n; i++){ t = a ; for(j = 1; j <= i; j++){ c = getchar(); p[c - 'a'].x[p[c-'a'].num] = t; p[c - 'a'].y[p[c-'a'].num] = b; p[c - 'a'].num ++; t = t + 2*ghs; } a = a - ghs; b = b - 3.0; } int flag = 0; for(i = 0; i < 26; i++){ if(p[i].num != 3)continue; if(judge(p[i])){printf("%c",'a'+i);flag = 1;} } if(!flag){ printf("LOOOOOOOOSER!"); } putchar('n'); } return 0;}
