S=raw_input()
L=list(S)
win=0
lose=0
for a in L:
    if a=='O':
        win+=1
        lose=0
        if win==3:
            print 'East'
            break
    elif a=='X':
        lose+=1
        win=0
        if lose==3:
            print 'West'
            break
if win<3 and lose<3:
    print 'NA'