Syntax Error: can't assign function to call

[darsheva]

def STR(a):
    a = str(a)
    
    for i in range(0, len(a) - 1, 2):
            print(chr(int(a[i:i+2]))),

STR(7269767679) = "HELLO"


a = 0
b = 22443938263631876368983
n = 928669833265826932708591

C = e * M 
M = d * C
e = 141597355687225811174313
d = 87441340171043308346177
C = (236857987845294655469221, 12418605208975891779391)
# STR(M.x) + STR(M.y) = ?

-----------------------------
end of code
-----------------------------
This is what it is having a problem with
Can anybody help?

STR(7269767679) = "HELLO"

[bvdet]

As the error message states, you cannot assign the string "HELLO" to a function call. The function returns something (or None), so you would assign the result to an identifier. What are you trying to do?