[ONP] error!!!

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Stack;

public class type {
    public static void main(String args[]) throws NumberFormatException,
            IOException {
        String s;
        Stack<Character> st;
        // use scanner or use bufferedinputstream
        /* Scanner scanner = new Scanner(System.in); */
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        int a = Integer.parseInt(in.readLine());
        while ((a--) > 0) {
            s = in.readLine();
            st = new Stack<Character>();
            for (int i = 0; i < s.length(); i++) {
                // use stack to solve problem
                if (s.charAt(i) == '(' || s.charAt(i) == ')')
                    ;
                else if (s.charAt(i) == '+' || s.charAt(i) == '-'
                        || s.charAt(i) == '*' || s.charAt(i) == '/'
                        || s.charAt(i) == '^') {
                    // pop stack and print to console
                    if (!st.isEmpty())
                        System.out.print(st.pop());
                    st.push(s.charAt(i));
                } else if (s.charAt(i) >= 'a' && s.charAt(i) <= 'z') {
                    // push s.charAt(i) to stack
                    System.out.print(s.charAt(i));
                    // System.out.print(st.pop());
                }
            }
            while (!st.isEmpty()) {
                System.out.print(st.pop());
            }
            // System.out.println(s);
        }
    }
}