Task: Program Execution
Input (English): 12, 13, ['5521', '7377', 'a', 'a', 'p', '3099', 'G', '1335', 'g', '1665', '8583', 'H', 'r', '1585', 'g', '1961', 'R', 'k', 'N', 'Z', '539']
Output (English): Hr