Concatenation of strings

Strings can be concatenated by simple addition:
a = 'This is A'
b = 'This is B'
c = a + ' ---> ' + b
print(a)              # This is A
print(b)              # This is B
print(c)              # This is A ---> This is B

Challenge

Given three strings in the input, create a fourth one called all3, which contains the concatenation of all 3 separated by <=> . Print the value of all3 in the output.
Input
Output
Hi, I am line 1 and I am line 2 and I am line 3
Hi, I am line 1 <=> and I am line 2 <=> and I am line 3
 

Constraints

Time limit: 2 seconds

Memory limit: 512 MB

Output limit: 1 MB

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