13

for i in range(9999, 1001, -1):
    frst_num = str(i)
    sums = [sum(map(int, c)) for c in zip(frst_num, frst_num[1:])]
    sums.remove(min(sums))
    if str(sorted(sums)[0]) + str(sorted(sums)[1]) == '37':
        print(i)
        break