There was an error with the input

0:00 0:50 1:40 2:30 3:20 4:10 5:00 5:50 6:40 7:30 8:20 9:10 10:00 10:50 11:40 12:30 13:20 14:10 15:00 15:50 16:40 17:30 18:20 19:10 20:00 20:50 21:40 22:30 23:20 24:10 25:00 25:50 26:40 27:30 28:20 29:10 30:00 30:50 31:40 32:30 33:20 34:10 35:00 35:50 36:40 37:30 38:20 39:10 40:00 40:50 41:40 42:30 43:20 44:10 45:00 45:50 46:40 47:30 48:20 49:10 50:00 50:50 51:40 52:30 53:20 54:10 55:00 55:50