First common element from two lists

Question

x = [8,2,3,4,5]
y = [6,3,7,2,1]

How to find out the first common element in two lists (in this case, \"2\") in a concise and elegant way? Any list

Answer 1

def first_common_element(x,y):
    common = set(x).intersection(set(y))
    if common:
        return x[min([x.index(i)for i in common])]