Task: Program Execution
Input (English): 6, 21, ['s', '5521', '6919', '4659', '2249', 'n', '3457', 'Z', '1607', '7177', '9539', 't', 'd', '5663', '1379', '9239', 's', 'M', '8871', '9515', 'e']
Output (English): n3457Z160771779539td566313799239sM88719515e