Task: Program Execution
Input (English): pBkzMurqCpijHNGAtWIEvfqniTrYS, FnjJWfCpijHNGAtWIEvrIpBQg
Output (English): a, b, c, e, f, g, h, i, j, k, m, n, p, q, r, s, t, u, v, w, y, z