bytedance exam decode numbers to characters

decode.py

from queue import Queue
s=input().strip("\n")
l=len(s)
q=Queue()
# flag
# 0: nothing
# 1: in 1
# 2: in 2
q.put(("",0,0),)

d0=dict([(i,c)for i,c in zip("123456789","ABCDEFGHI")])
d1=dict([(i,c)for i,c in zip("0123456789","JKLMNOPQRS")])
d2=dict([(i,c)for i,c in zip("0123456","TUVVWXYZ")])
while not q.empty():
    o,n,flag=q.get()
    if flag==0:
        if n==l:
            print(o)
            continue
        c=s[n]
        if c=="1":
            q.put((o+"A",n+1,0),)
            q.put((o,n+1,1),)
        elif c=="2":
            q.put((o+"B",n+1,0),)
            q.put((o,n+1,2),)
        else:
            q.put((o+d0[c],n+1,0),)
    elif flag==1:
        if n==l:
            continue
        c=s[n]
        q.put((o+d1[c],n+1,0),)
    elif flag==2:
        if n==l:
            continue
        c=s[n]
        if c in "0123456":
            q.put((o+d2[c],n+1,0),)
        else:
            continue