Task: Program Execution
Input (English): QgCYsSClSvWCrLNIuxCCsSmsxrWvTRyt, rpztrVYgALMLvarLNIuxCCsSmsxrABoRinhmfmqRk
Output (English): a, b, c, f, g, h, i, k, l, m, n, o, p, q, r, s, t, u, v, x, y, z