Python function that takes user input and replaces characters in odd position with #

Take a string that contains at least four characters from user input. Replace all the characters that are in odd positions (NOT index values) with hashes, '#'. Print the resulting string.

Requirement: Must use the for loop and the if/else statement.

input is: abcdef

s = input()
t = ''
for i in range(len(s)):
    if (i%2)!=0:
        t = t + s[i]
    else:
      print('#')
print(t)

result should be:

#b#d#f