Write a Python program that prints a square of size depending on an entered value.

The program first reads the size of the square and then prints the square with a pattern

according to the examples below. The figure shows two different executions of the

program.

You should use a pair of nested for$-$loop for printing the pattern and the program

should validate the input to make sure that it is an integer and is larger than $0,$ prompt

an error message for invalid input.