Task: Program Execution
Input (English): 6, 21, ['X', 'X', 'p', '4701', '655', 'o', '4457', 'd', '6861', '9839', '4973', 'M', '9239', '5911', 'W', '2197', 'z', '8635', 'C', '4969', 'J', 'B', '4487', '3021', 'v', 'P']
Output (English): J9694C5368z7912W11959329M379493891686d7544o