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Enter letter grades. Or Enter the EOF character to end input. CUse Ctl + D. or Ctl + Z) Type "A" and hit enter key, type "b" and hit enter key, type "C" and hit enter key, type c and hit enter key, type D and hit enter key, type "f' and hit enter key, and type 1 and hit entert' key. Enter letter grades. Or Enter the Eof character to end input. CUse Ct1 + D. or Ctl + Z> Enter letter grades. Or Enter the EOF character to end input. CUse Ct1 D. or Ctl + Z> Enter letter grades. Or Enter the EOF character to end input. (Use Ctl + D. or Ctl + Z) Enter letter grades. (Use Ctl + D, or Ctl + Z> Or Enter the EOF character to end input. Enter letter grades. Or Enter the EOF character to end input. CUse Ctl + D, or Ctl + Z) xXxx An incorrect letter grade entered. XXXX "1" is not a proper letter grade. Enter letter grades. Or Enter the Eof character to end input. (Use Ctl + D. or Ctl + Z) Type "123 and hit "enter" key 123 XXXX An incorrect letter grade entered. XXXX "1" is not a proper letter grade. Enter letter grades. Or Enter the EOF character to end input. (Use Ctl + D, or Ctl + Z) XXXX An incorrect letter grade entered. XXXX "2" is not a proper letter grade. Enter letter grades. Or Enter the EOF character to end input. (Use Ctl + D, or Ctl + Z) xXxx An incorrect letter grade entered. XXXX "3" is not a proper letter grade. Enter letter grades. --> Or Enter the Eof character to end input. CUse Ctl + D. or Ctl + Z) Enter letter grades. Or Enter the EOF character to end input. CUse Ctl + D. or Ctl + Z) Type "A" and hit enter key, type "b" and hit enter key, type "C" and hit enter key, type c and hit enter key, type D and hit enter key, type "f' and hit enter key, and type 1 and hit entert' key. Enter letter grades. Or Enter the Eof character to end input. CUse Ct1 + D. or Ctl + Z> Enter letter grades. Or Enter the EOF character to end input. CUse Ct1 D. or Ctl + Z> Enter letter grades. Or Enter the EOF character to end input. (Use Ctl + D. or Ctl + Z) Enter letter grades. (Use Ctl + D, or Ctl + Z> Or Enter the EOF character to end input. Enter letter grades. Or Enter the EOF character to end input. CUse Ctl + D, or Ctl + Z) xXxx An incorrect letter grade entered. XXXX "1" is not a proper letter grade. Enter letter grades. Or Enter the Eof character to end input. (Use Ctl + D. or Ctl + Z) Type "123 and hit "enter" key 123 XXXX An incorrect letter grade entered. XXXX "1" is not a proper letter grade. Enter letter grades. Or Enter the EOF character to end input. (Use Ctl + D, or Ctl + Z) XXXX An incorrect letter grade entered. XXXX "2" is not a proper letter grade. Enter letter grades. Or Enter the EOF character to end input. (Use Ctl + D, or Ctl + Z) xXxx An incorrect letter grade entered. XXXX "3" is not a proper letter grade. Enter letter grades. --> Or Enter the Eof character to end input. CUse Ctl + D. or Ctl + Z)