7. Write a client program that uses Stack abstract data to compile a simple arithmetic expression without parentheses. For example, the expression a + b * c – d should be compiled according to the following table:The table shows the order in which the operations are performed ( * , +, -) and operands for each operator. The result column gives the name of an identifier (working backward from z) chosen to hold each result. Assume that the operands are the letters a through m and the operators are