Write a C++ program that

5. Given an expression s includes numbers, letters and brackets. Number represents the number of repetitions inside the brackets (can be a string or another expression). Please expand expression to be a string. Example s" abe3[a], return abcaaa s3abc], return abcabcabc . 312[ad]3[pf]jxyz, return adadpfpfpfadadpfpfpfadadpfpfpfxyz