Create a function which accepts one arbitrary string as an argument, and return a string of length 26.
The objective is to set each of the 26 characters of the output string to either `'1'` or `'0'` based on the fact whether the Nth letter of the alphabet is present in the input (independent of its case).
So if an `'a'` or an `'A'` appears anywhere in the input string (any number of times), set the first character of the output string to `'1'`, otherwise to `'0'`. if `'b'` or `'B'` appears in the string, set the second character to `'1'`, and so on for the rest of the alphabet.
For instance:
```
"a   **&  cZ"  =>  "10100000000000000000000001"
```
def change(st):
    new = ""
    st = st.lower()
    for letter in "abcdefghijklmnopqrstuvwxyz":
        if letter in st:
            new += "1"
        else:
            new += "0"
    return new

def change(st):
    new = ""
    st = st.lower()
    for letter in "abcdefghijklmnopqrstuvwxyz":
        if letter in st:
            new += "1"
        else:
            new += "0"
    return new
