find index in alphanumeric

 #digit index:

s=input()

l=len(s)

for i in range(l):

    if(s[i].isnumeric()):

        print(i,end="")

#Another method:

def index(a):

    res=""

    for i in range(len(a)):

        if(a[i]>'0' and a[i]<'9'):

            res=res+str(i)

    return res

s=input()

r=index(s)

print(r)