Output is right but all test cases failing

#1
#2

instead of comparing s1 with s2, you need to compare s1+s2, with s2+s1 because the number formed would either contain s1+s2 or s2+s1.
Corrected Code

#3

i have tested on various inputs the result is same

#4

1
2
781 78
answer should be 78781, but your code would give 78178

#5

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