Connect Four is a two-player board game in which the players alterantely drop colored disks into a seven-column, six-row vertically suspended grid, as shown below.

The objective of the game is to connect four same-colored disks in a row, a column, or a diagonal before your opponent can do likewise. The program prompts two players to drop a red or yellow disk alternately. Whenever a disk is dropped, the program redisplays the board on the console and determines the status of the game (win, lose, or continue). Here is a sample run:

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Drop a red disk at column (0-6): 0 ? Enter

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