нужно решить а то отчислят , заранее

Const CSize1=7;
      CSize2=6;
      CSize3=5;
type TMas1=array[1..CSize1,1..CSize1] of integer;
     TMas2=array[1..Csize2, 1..CSize2] of integer;
     TMas3=array[1..Csize3, 1..CSize3] of integer;

var A1:TMas1;
    A2:TMas2;
    A3:TMas3;
    i,j,x, y:byte;

function zero(i:integer):boolean;
begin
zero:=false;
if i=0 then zero:=true;
end;

function interval(i:integer):boolean;
begin
interval:=false;
if (i<=12) and (i>=1) then interval:=true;
end;

begin
X:=0;
Y:=0;
randomize;
for i:=1 to CSize1 do
 begin
 for j:=1 to CSize1 do
  begin
  A1[i, j]:=random(50);
  write(A1[i, j]:3);
  if zero(A1[i, j]) then inc(x);
  if interval(A1[i,j]) then inc(y);
  end;
 writeln;
 end;
writeln('Kol-vo 0 =', x);
writeln('Kol-vo v intervale=', y);
writeln;
x:=0;
y:=0;
for i:=1 to CSize2 do
 begin
 for j:=1 to CSize2 do
  begin
  A2[i, j]:=random(50);
  write(A2[i,j]:3);
  if zero(A1[i,j]) then inc(x);
  if interval(A2[i,j]) then inc(y);
  end;
 writeln;
 end;
writeln('Kol-vo 0 =', x);
writeln('Kol-vo v intervale=', y);
writeln;
x:=0;
y:=0;
for i:=1 to CSize3 do
 begin
 for j:=1 to CSize3 do
  begin
  A3[i, j]:=random(50);
  write(A3[i,j]:3);
  if zero(A3[i,j]) then inc(x);
  if interval(A3[i,j]) then inc(y);
  end;
 writeln;
 end;
writeln('Kol-vo 0 =', x);
writeln('Kol-vo v intervale=', y);
writeln;
x:=0;
y:=0;
end.

1.
var
  s: string;
  i, count: integer;
begin
  writeln('Vvedite stroky: ');
  readln(s);
  for i := 1 to length(s) - 2 do
    if copy(s, i, 3) = 'abc' then
      count := count + 1;
  writeln('Kol-vo: ', count);
end.
2.
var
  s1, s2: string;
  i, len1, len2: integer;
begin
  writeln('Vvedite stroky 1: ');
  readln(s1);
  writeln('Vvedite stroky 2: ');
  readln(s2);
  len1 := length(s1);
  len2 := length(s2);
  if len1 > len2 then writeln('1 stroka dlinnee')
  else if len1 < len2 then writeln('2 stroka dlinnee')
  else writeln('dlini strok ravnie')
end.
3.
var
  s1, s2, s3: string;
begin
  writeln('Vvedite stroky 1: ');
  readln(s1);
  writeln('Vvedite stroky 2: ');
  readln(s2);
  s3 := s1[1] + s1[2] + s2[1] + s2[2];
  writeln('Novaja stroka: ', s3);
end.