Giúp mk với mai mk phải nộp r

Program HOC24;

var s: string;

i,d: byte;

begin

write('Nhap xau: '); readln(s);

d:=0;

for i:=1 to length(s) do if (s[i]='b') or (s[i]='B') then d:=d+1;

write('Co ',d,' ki tu B trong xau');

readln

end.

Program HOC24;

var s: string;

begin

write('Nhap xau: '); readln(s);

write('Xau sau khi loc: ');

for i:=1 to length(s) do

if s[i] in ['A'..'z'] then write(s[i]);

readln

end.

tham khảo

uses crt;

var st:string;

i,d:integer;

begin

clrscr;

readln(st);

d:=length(st);

for i:=1 to d do 

  if (not (st[i] in ['A'..'Z'])) and (not (st[i] in ['a'..'z'])) then write(st[i]);

readln;

end.

uses crt;

var st:string;

begin

clrscr;

write('Nhap xau:'); readln(st);

writeln(length(st));

readln;

end.

2:

uses crt;

var st:string;

d,i,dem1,dem2:integer;

begin

clrscr;

write('Nhap xau:'); readln(st);

d:=length(st);

dem1:=0;

dem2:=0;

for i:=1 to d do

  begin

if st[i] in ['0'..'9'] then inc(dem1);

if (st[i] in ['a'..'z']) or (st[i] in ['A'..'Z']) then inc(dem2);

end;

writeln('So ki tu la chu so la: ',dem1);

writeln('So ki tu la chu cai la: ',dem2);

for i:=1 to d do 

  if st[i] in ['0'..'9'] then delete(st,i,1);

writeln('Xau sau khi xoa cac chu so la: ',st);

readln;

end. 

Chương trình:

program bai_10_chuong_4;

uses crt;

var

s: string[100];

i, dem: integer;

Begin

clrscr;

write('Nhap xau vao:'); readln(s); dem:= 0;

for i:= 1 to length(s) do

if ('0'<=s[i]) and(s[i]<=’9') then dem:=dem+l;

Writeln('Trong xau s co '»dem,' chu so thap phan');

readln;

End.

uses crt;

var st:string;

i,d,dem:integer;

begin

clrscr;

write('Nhap xau:'); readln(st);

d:=length(st);

writeln('Xau vua nhap la: ',st);

dem:=0;

for i:=1 to d do 

  if st[i] in ['0'..'9'] then inc(dem);

writeln(dem);

readln;

end.

chj check ib em ạ

#include <bits/stdc++.h>

using namespace std;

string s;

int d,i,dem;

int main()

{

cin>>s;

d=s.length();

dem=0;

for (i=0; i<=d-1; i++)

if (s[i]=='a') dem++;

cout<<dem;

return 0;

}