Task: Program Execution
Input (English): MgDPwkrwBQGCnkLqZoXXJu, RRJiSLZYTkrwBQGCnkLqZoXmOryPId
Output (English): b, c, d, g, i, j, k, l, m, n, o, p, q, r, s, t, w, x, y, z