def isSpecial(nr):
    lastC = nr % 10
    nr = nr // 10
    while(nr>0):
        c = nr % 10
        if abs(lastC - c) != 1:
            return False
        lastC = c
        nr = nr //10
    return True


def nrAsList(nr):
    list = []
    while(nr > 0):
        list.insert(0, nr % 10)
        nr = nr // 10
    return list

def makeSpecial(nr):
    nrStr = str(nr)
    listNr  = nrAsList(nr)
    print(listNr)
    l = len(nrStr)
    print(str(l))
    posC = 0
    while(posC <l):
        print(posC)
        potentialSpecial = int(nrStr[0:posC]+ nrStr[posC+1:l])
        print(str(potentialSpecial))
        if(isSpecial(potentialSpecial)):
            return potentialSpecial
        posC+=1
    return 0

n = 9873654
special = makeSpecial(n)
print(str(special))