Make sure to answer it correctly!

Declare three strings called str $1,$ str $2$ and str $3$ of size $7.$ Use string instructions to see if any of these strings are the same as the other one. If no strings are the same, BL should contain zero at the end of your code. If str $1$ and str $2$ are the same, BL must have $1.$ If str $2$ and str $3$ are the same BL must be $2.$ If str $1$ and str $3$ are the same BL must be $3.$