What wrong in this Code?

n = int(input())
d = n
x = []
a = n

def check(a,d):
    if(d==0):
        pass
    elif(d==10):
        x.append(1)
    elif(a<10):
        x.append(a)
        d = ((d-a)/10)
        check(d,d)
    elif(a%10==0 and a==10):
        x.append(0)
        d = (d/10)
        check(d,d)
    elif(a%10==0):
        a=a/10;
        check(a,d)
    else:
        a=a%10;
        check(a,d)
check(a,d)
x.reverse()     

l = len(str(n))            

count = 0
for i in range(0,l-2):
        if((x[i]-x[i+1])==-1 or (x[i]-x[i+1])==1):
                count = count + 1
print(count)