the function must return an integer. if there is no valid answer or the answer doesn't fit in 32bit integer print-1 using python Ram likes to solve tricky problems just like you. He was recently trying to solve a problem but could not solve it, so he needs your help. Ram has a positive integer n, and he wants to find the smallest integer, which has exactly the same digits existing in the integer n and is greater in value than n. If there is no valid answer, print -1. Example There is one input parameter that contains an integer n. Function Description Complete the calculate() function in the editor. calculate() has the parameter n : integer.