concatenate unit digits are equal in c

The program must accept an integer M and a digit N as the input. The program must print the concatenated value of M and N as the output if the unit digit of M is not equal to N. Else the program must print M without it’s unit digit as the output.

Example Input/Output 1:
Input:
981 2

Output:
9812

solution:

int main()

{

int a,b;

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

if(abs(a)%10!=abs(b)%10){

    printf("%d%d",a,b);

}

else{

    printf("%d",a/10);

}

}