import java.util.Scanner;

public class Postfix {

    public static void main(String [] args) {

	Stack operands = new Stack();
	
	char[] expression = {'7','5','-','4','*','6','1','2','+','/','+'};

	for(int i = 0; i < expression.length; i++) {
	    
	    // Case 1: the next token is a number
	    if(Character.isDigit(expression[i])) {



	    }

	    // Case 2: the next token is an operator
	    else {

		int b =                         ;

		int a =                         ;

		char op =                       ;

		// Our next action depends on what operator we saw











	    }
	}

	// Print out the result of the computation



    }


}