V1 = map(int,raw_input().split('.'))
V2 = map(int,raw_input().split('.'))

if V1[0] < V2[0]:
    print "NO"
elif V1[0] == V2[0] and V1[1] < V2[1]:
    print "NO"
elif V1[0] == V2[0] and V1[1] == V2[1] and V1[2] < V2[2]:
    print "NO"
else:
    print "YES"