Var a: string;

 i, Dem: integer;

Begin

 writeln(‘nhap xau:’);

 Readln(a);

 Dem:=0;

 For i:=1 to length(a) do

 If (‘a’<=a[i]) and (a[i]<=’z’)

  Dem:= Dem+1;

 Writeln(Dem);

 Readln

End.

uses crt;

var st:string;

i,d,dem:integer;

begin

clrscr;

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

d:=length(st);

dem:=0;

for i:=1 to d do 

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

writeln(dem);

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. 

uses crt;

var a,b:string;

i,d:integer;

begin

clrscr;

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

d:=length(a);

b:=''

for i:=1 to d do 

  if a[i] in ['A'..'Z'] then b:=b+a[i];

writeln(b);

readln;

end.

xau = input('Nhập xâu kí tự: ')

chu_cai, chu_so, ki_tu_khac = 0, 0, 0

for kt in xau:

      if kt.isalpha():

            chu_cai += 1

      elif kt.isdigit():

            chu_so += 1

      else:

            ki_tu_khac += 1

print('Số lượng kí tự chữ cái:', chu_cai)

print('Số lượng kí tự chữ số:', chu_so)

print('Số lượng kí tự khác:', ki_tu_khac)

Program Xau;

Uses crt;

Var St: String;

    i: longint;

Begin

        Clrscr;

        Write('Nhap xau: '); Readln(St);

        For i:=1 to length(St) do

                St[i] := Upcase(St[i]);

        Write('St = ',St);

        Readln

End.