Выделить первый слог в слове, в котором не менее двух слогов- QBasic(Бейсик)

DEFINT A-Z
DIM S AS STRING, Sh AS STRING
   CLS
   INPUT "Vvedite slovo : ", S
   S = LCASE$(S)
   Sh = "aeiouy"
 FOR i = 1 TO LEN(S)
    '  Ищем 2-ю гласную
    IF k < 2 THEN
      FOR j = 1 TO LEN(Sh)
        IF MID$(S, i, 1) = MID$(Sh, j, 1) THEN k = k + 1: c = i: EXIT FOR
      NEXT
      IF k = 1 THEN c2 = i - 1
    END IF
    '  Идем назад от 2-й гласной согласные
    IF k = 2 THEN
      k = 0
      FOR l = c - 1 TO c - 2 STEP -1
        IF l > 0 THEN
         f = 1
         FOR j = 1 TO LEN(Sh)
         IF (l > 0) AND (MID$(S, l, 1) = MID$(Sh, j, 1)) THEN f = 0: t = l
         NEXT
         k = k + f
        END IF
      NEXT
       IF t = c - 1 THEN PRINT "Oshibka! Glasnye dolgny razdelatsa soglasnimi."
       IF k = 1 THEN c = c2: GOTO 5
       IF k = 2 THEN c = c - 2: GOTO 5
      EXIT FOR
    END IF
 NEXT
PRINT "Slog ne naiden!"
END
5 PRINT "Pervij slog : "; LEFT$(S, c)