Python - How can I eliminate same characters with same index between two strings? : 

For example, two strings are given as "hello" and "sello" 
It removes the same characters with the same index between two strings.

After the elimination loop, it should return "h" and "s" respectively.

And for example, two strings are given as "sony" and "nani" 
then it should return "soy" and "nai"  