Task: Program Execution
Input (English): MDpcUVFJmKfXMIjrdqGLqHjVYGviBwgV, WxlsKCtImRBcmVFJmKfXMIjrdqGLZkwhRB
Output (English): b, c, d, f, g, h, i, j, k, l, m, q, r, s, t, v, w, x, z