Each player in a tournament plays six games. There are no ties. The
tournament director places the players in groups based on the results of
games as follows:

• if a player wins 5 or 6 games, they are placed in Group
  1;

• if a player wins 3 or 4 games, they are placed in Group
  2;

• if a player wins 1 or 2 games, they are placed in Group
  3;

• if a player does not win any games, they are eliminated from the
  tournament.

Write a program to determine which group a player is placed in.

The input consists of six lines, each with one of two possible
letters: W (to indicate a win) or
L (to indicate a loss).

The output will be either 1,
2, 3 (to indicate
which Group the player should be placed in) or
-1 (to indicate the player has been
eliminated).

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출처 CCC 2016 Junior