Var N   : Integer;
    C   : Array[0..1500] of Char;
    A   : Array[0..1500] of Integer;
    S   : Array[1..10] of String;
 Total  : Longint;

Procedure Main(X : Integer);
Var i,j : Longint;
Begin
  If X<N then
    Begin
      For i := 1 to N do
        If (Total+i+(A[X]-A[i-1])) mod (N+1) = 0 then
          Begin
            For j := 1 to i-1 do
              Write(C[j]);
            Write(1);
            For j := i to X do
              Write(C[j]);
            Writeln;
            Exit;
          End else If (Total+(A[X]-A[i-1])) mod (N+1) = 0
then
                     Begin
                        For j := 1 to i-1 do
                          Write(C[j]);
                        Write(0);
                        For j := i to X do
                          Write(C[j]);
                        Writeln;
                        Exit;
                     End;
    End;
  If X>N then
    Begin
      For i := 1 to N+1 do
        If (Total-(A[X]-A[i])-(A[i]-A[i-1])*i) Mod (N+1)=0
then
          Begin
            For j := 1 to i-1 do
              Write(C[j]);
            For j := i+1 to X do
              Write(C[j]);
            Writeln;
            Exit;
          End;
    End;
  If X=N then
    Begin
      If Total Mod (N+1)=0 then
        Begin
          For j := 1 to N do
            Write(C[j]);
          Writeln;
          Exit;
        End;
      For i := 1 to X do
        If C[i]='1' then
          If (Total-i) Mod (N+1)=0 then
            Begin
              C[i] := '0';
              For j := 1 to X do
                Write(C[j]);
              Writeln;
              Exit;
            End;
    End;
End;


Procedure Init;
Var i,j,k,l : Longint;
    BB      : Boolean;
    Long    : Byte;
Begin
  Readln(N);
  Long := (N+1) Div 255;
  If (N+1) mod 255<>0 then Inc(Long);
  Repeat
    Fillchar(S,Sizeof(S),0);
    For i := 1 to Long do
      Read(S[i]);
    If Pos('0',S[1])=0 then
      If Pos('1',S[1])=0 then Break;
    Readln;
    j := 0;
    Fillchar(A,Sizeof(A),0); Total := 0;
    For i := 1 to Long do
      For k := 1 to Length(S[i]) do
        Begin
          If S[i][k] in ['0','1'] then
            Begin
              Inc(j);
              A[j] := A[j-1]+Ord(S[i][k])-48;
              Inc(Total,(Ord(S[i][k])-48)*j);
              C[j] := S[i][k];
            End;
        End;
    Main(j);
  Until Eof;
End;

Begin
  Init;
End.

If you write:
S: array[1..10] of string[255];
Then everything is all right.
Because Ural use a compiler like Delphi,so that string
means ANSI string.