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Please fix the code given below to perform subtraction of two inputs:

#include <stdio.h>
#include <stdlib.h>

int readNumber(); 
void $1(int number);

int main(int argc, char *argv[])
{
  
  int a, b;
  a = $2;
  b = $3;
  
  writeNumber($4);

  return 0;
}

void writeNumber(int number){
     printf("%d",number);
     return;
}

int readNumber(){
    int x;
    scanf("%d", &x);
    return x;    
}

 

Input 1

10 11

Output 1

10 11
-1

 

Input 2

90 12

Output

90 12
78

 

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