<span style="color:#323232;">letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
</span><span style="color:#323232;">for i in range(len(letters)):
</span><span style="color:#323232;"> for j in range(len(letters)):
</span><span style="color:#323232;"> for k in range(len(letters)):
</span><span style="color:#323232;"> for l in range(len(letters)):
</span><span style="color:#323232;"> print(letters[i]+letters[j]+letters[k]+letters[l])
</span><span style="color:#323232;">print("CHOPPER")
</span>