TESTLANG interpreter

i=input(">>").split()
cmd=0;s=[];inp='';o=[]
while len(i)!=0:
 cmd+=1
 if i[0]=="out":
  if i[1]=="char":
   o.append(chr(int(i.pop(2))))
   i.pop(0);i.pop(0)
  else:o.append(i.pop(1));i.pop(0)
 elif i[0]=="note":i.pop(0);i.pop(0)
 elif i[0]=="in":inp=input("input\n");i.pop(0)
 elif i[0]=="push":
  if i[1]=="in":s.append(inp);i.pop(0);i.pop(0)
  elif i[1]=="out":o.append(s.pop(0));i.pop(0);i.pop(0)
  else:s.append(i.pop(1));i.pop(0)
 elif i[0]=="op":
  if i[1]=="plus":
   s.append(str(int(s.pop(0))+int(s.pop(0))))
   i.pop(0);i.pop(0)
  elif i[0]=="end":print("".join(o));break
  else:print(f"CMD:{cmd} UNDEFINED COMMAND");break