Why I'm not getting output

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Python

def chac(a):
if (len(a>1)):
print("enter only one alphabet")
elif a=='a' or a=='e' or a=='i' or a=='o' or a=='u':
print ("its a vowel")
else:
print("its not a vowel")

a=input("enter a single char:")
chac(a)

What I have tried:

getting this error
Traceback (most recent call last):
File "C:/Users/techw/AppData/Local/Programs/Python/Python310/ifelse.py", line 10, in <module>
chac(a)
File "C:/Users/techw/AppData/Local/Programs/Python/Python310/ifelse.py", line 2, in chac
if (len(a>1)):
TypeError: '>' not supported between instances of 'str' and 'int'