import java.util.*;
import java.lang.*;

public class Calc1 {

    public static void main (String [] args) {

        Scanner scan = new Scanner(System.in);

        int plus, minus, delat, ganger, upphojt, avsluta, rotenur;
        String strang, sum1, sum2;
        boolean OK=true;

            System.out.println("Wilkommen till min miniraknare skriv in ett uttryck bestoende av 2 termer, operatorerna du kan velja mellan ar: +, -, *, /, ^ och sqrt, skriv exit om du vill avsluta");

            for(int n=0; n<strang.length();n++)
            {
                char q = strang.charAt(n);
                if (q!='0'&&(q!='1')&&(q!='2')&&(q!='3')&&(q!='4')&&(q!='5')&&(q!='6')&&(q!='7')&&(q!='8')&&(q!='9')&&(q!='+')&&(q!='-')&&(q!='/')&&(q!='*')&&(q!='^')&&(q!='s')&&(q!='q')&&(q!='r')&&(q!='t')&&(q!='e')&&(q!='x')&&(q!='i')&&(q!='t'))
                OK=false; //dock ej helt felsäker då en inmatning av srqt skulle anses som korrekt
            }
            if (OK==false){
                System.out.println("Nu vart nogot fel!");
            }








while(true) {

                String textbit = scan.nextLine();
                plus = textbit.indexOf("+");
                minus = textbit.indexOf("-");
                delat = textbit.indexOf("/");
                ganger = textbit.indexOf("*");
                upphojt = textbit.indexOf("^");
                rotenur = textbit.indexOf("sqrt");
                avsluta = textbit.indexOf("exit");


        if (plus > -1) {
            sum1 = textbit.substring(0, plus);
            sum2 = textbit.substring(plus+1);
            double tal1 = Double.parseDouble(sum1);
            double tal2 = Double.parseDouble(sum2);
            System.out.println("="+(tal1+tal2));
        }

        else if (minus > -1) {
            sum1 = textbit.substring(0, minus);
            sum2 = textbit.substring(minus+1);
            double tal1 = Double.parseDouble(sum1);
            double tal2 = Double.parseDouble(sum2);
            System.out.println("="+(tal1-tal2));
        }

        else if (delat > -1) {
            sum1 = textbit.substring(0, delat);
            sum2 = textbit.substring(delat+1);
            double tal1 = Double.parseDouble(sum1);
            double tal2 = Double.parseDouble(sum2);
            System.out.println("="+(tal1/tal2));
        }

        else if (ganger > -1) {
            sum1 = textbit.substring(0, ganger);
            sum2 = textbit.substring(ganger+1);
            double tal1 = Double.parseDouble(sum1);
            double tal2 = Double.parseDouble(sum2);
            System.out.println("="+(tal1*tal2));
        }

        else if (upphojt > -1) {
            sum1 = textbit.substring(0, upphojt);
            sum2 = textbit.substring(upphojt+1);
            double tal1 = Double.parseDouble(sum1);
            double tal2 = Double.parseDouble(sum2);
            System.out.println("="+Math.pow(tal1,tal2));
        }

        else if (rotenur > -1) {
            sum2 = textbit.substring(rotenur+4);
            double tal1 = Double.parseDouble(sum2);
            System.out.println("="+Math.sqrt(tal1));
        }

        else if (avsluta > -1)  {
            System.exit(0);

            }
        }
    }
}







/*  .indexOf (ange en int) = returnerar en int
    .length() = en int
    .substring(ange en int) = en string
    .substring(ange en int, ange en till int) =en string
    Integer.parseInt(ange en sträng) = blir en int */