My compact, one-liner solution…

print(np.loadtxt(sys.stdin, int).min(axis=1).max())

After I submitted this solution, it passed all the tests, and I began posting about it here, I realized something. I didn't skip the first line of input containing N and M as I usually do.

But my one-liner passed all the tests anyway! I'm just lucky that making those two values part of the array didn't make any difference in the results.

The solution I should've written was…

_ = input()  # We don't need N or M.  Skip them!
print(np.loadtxt(sys.stdin, int).min(axis=1).max())

Inspired by another user's comments about using N and M, although they're not necessary, I wrote a solution that uses them…

print(((NM := list(map(int, input().split()))),
    np.loadtxt(sys.stdin, int)[:NM[0], :NM[1]].min(axis= 1).max())[1])