Write a program that finds the number of different characters in a character string (text) entered by the user on the keyboard. In your program, you need to write a function that finds the number of different characters in a given string, compatible with the prototype given below. You must use a single loop in the function. Do not write a recursive function and do not call another function (library or you have written it yourself) from within the function. Do not call anv other function from inside the function. Do not use nested loop structures. Do not use two nested loops instead of a single loop in the algorithm.

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