Book of Potion making - HackerEarth Solution

t = list(input())
count = 0
if len(t)>=10:
    for i in range(len(t)):
        d = (i+1)*int(t[i])
        count+=d
    if count%11==0:
        print('Legal ISBN')
    else:
        print('Illegal ISBN')
else:
    print('Illegal ISBN')