Write a program that does the following:

1. Reads 4 characters from standard input (all on one line, no spaces). The code should read one character at a time, using a separate variable for each character read.
2. Outputs the characters in reverse order, one at a time, to standard output. For example, entering cake producesekac

Im struggling to make this as simple as possible without using scanf. I need to use getchar/putchar