Confusion in CHDOGS's Output statement

help
1

Can someone clarify me what this means

Output

For each test case, output a single line containing a real number corresponding to the answer of the problem. The answer will be considered correct if its absolute or relative error does not exceed 10-6.

2

if 6 digits after point matches the answer then it is correct.
a.ABCDEFvcybkk ans-a.ABCDEFjgoiohi correct

3

U r not supposed to ask something about contest problem this is output related problem u could ask it straight.