(Source: USSR Maths Olympiad)

200 hundred students are positioned in 10 rows and 20 columns at a school assembly.

From each of the 20 columns the shortest student is selected. The tallest of these 20 short students is tagged **A**. They return back to their places.

Next the tallest student from each row is selected, and from these tall students the shortest is tagged as **B**.

Which of the two students tagged is taller, assuming they are different people?

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