Task: Program Execution
Input (English): 7, 21, ['R', '757', '2681', '4557', 'y', 'A', '4079', 'r', 'g', '9625', 'B', '2175', '8425', 'i', '3269', '375', '4283', '7587', '1043', 'f', '4871']
Output (English): 1784f3401785738245739623i52485712B5269gr9704