Five cooperating processes execute concurrently. In four of theprocesses, each one outputs its designated letter/symbol: A, B, C,or ?. The fifth process reads input from the keyboard and stores itin shared memory. All concurrent processes are to be coordinated sothat they will output the letter/symbol in accordance to the inputmessage. The symbol ? is used to substitute for any letter/symbolthat is not A, B, nor C. For instance, after the fifth processcopies the string: GO BEACH! to shared memory, the other fourprocesses would coordinate and collectively output: ???B?AC??(assume all caps). After displaying one string, the fifth processgets the next string
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