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To get them sorted sort them into piles.
Pile (A) is February which has 28 days.
Pile (B) is ones with 30 days.
Pile (C) is ones with 31 days.
Look at February it starts on Saturday January ends on Friday.
If a month ends on lets say Tuesday the next month will start on the next day and start to link together.
To do this you need to know how many days they have.
Jan Feb Mach Apr May Jun Jul Aug Sep Oct Nov Dec
31 28 31 30 31 30 31 31 30 31 30 31