#File: ChapterLists/intersection.py 
""" Union and intersection of the two lists as sets
Enter ints (Ex: 3 4 5)?  4 5 6
Enter ints (Ex: 3 4 5)?   5 1 3 8
L1 = [4, 5, 6] L2 = [5, 1, 3, 8]
intersection = [5]
union        = [4, 5, 6, 1, 3, 8]
"""
def intersection(L1, L2):
    R = []          # R result nothing inside
    for e in L1:    # compare all with all
        for k in L2:
            if ( e == k):
                R.append(e) # only if they are equal add to R
    return R

def union(L1, L2):
    L = L1 + L2       # put all toghether
    R = []
    [ R.append(x) for x in L if x not in R ] # remove duplicates
    return R

def main():
    L1 = input( "Enter ints (Ex: 3 4 5)?  ").split( " " ) # input
    L2 = input( "Enter ints (Ex: 3 4 5)?   ").split( " " )
    L1 = [int(x) for x in L1]
    L2 = [int(x) for x in L2]
    print ("L1 =", L1, "L2 =", L2)
    print ("intersection =", intersection( L1,L2 ))
    print ("union        =", union( L1, L2 ))
     
main()