Problem:
Score : 100 points

Problem Statement

You are given two integers a and b.
Determine if a+b=15 or a\times b=15 or neither holds.

Note that a+b=15 and a\times b=15 do not hold at the same time.

Constraints

1 \leq a,b \leq 15

All values in input are integers.

Input

Input is given from Standard Input in the following format:

a b

Output

If a+b=15, print +;
if a\times b=15, print *;
if neither holds, print x.

Sample Input 1

4 11

Sample Output 1

+

4+11=15.

Sample Input 2

3 5

Sample Output 2

*

3\times 5=15.

Sample Input 3

1 1

Sample Output 3

x

1+1=2 and 1\times 1=1, neither of which is 15.

Solution in C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<stdio.h>
int main()
{
    int a,b,i=1;

    if(i<=15){

        scanf("%d%d",&a,&b);

    }
    if(a+b==15){

            printf("+\n");
            printf("%d+%d=%d\n",a,b,a+b);

        }else if(a*b==15){

         printf("*\n");

            printf("%d*%d=%d\n",a,b,a*b);
             }
        else{

            printf("x\n");
            printf("%d+%d=%d and %d*%d=%d, neither of which is 15.\n",a,b,a+b,a,b,a-b);




        }

     return 0;




}