Write a program in python that will take some string as an input and as well an array of integer that is the same length as the string. Following this, the string will be re-arranged such that the character at the nth position will move to the position n of the newly arranged string which is then returned to the user. For example:

Example:

Input string from user = abc and the array is [0, 1 , 2]

Then the output is simply abc, each letter matches the correct position.

Example:

Input string from user = aaiougrt and the array is [4,0,2,6,7,3,1,5]

Then the output will be arigatou

Assume the user always enters a string and an array that are the same length, if there is a mismatch between the two lengths, simply continue to ask the user until they enter a string and array that are matching length.