Sub RemplirCelluleVide()
Dim Cell As Range
Dim Plage As Range
Dim InputValue As String
On Error Resume Next
InputValue = "P"
With Worksheets("Essai")
Set Plage = .Range(.Cells(10, 3), .Cells(.Rows.Count, 1).End(xlUp))
For Each Cell In Plage
If IsEmpty(Cell) Then
Cell.Value = InputValue
End If
Next
End With
End Sub