uses crt;

const fi='dulieu.txt'

var f1:text;

st:string;

i,d:integer;

begin

clrscr;

assign(f1,fi); rewrite(f1);

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

d:=length(st);

for i:=1 to d do 

if (st[i] in ['A'..Z']) or (st[i] in ['0'..'9']) or (st[i]=#32) then write(f1,st[i]);

close(f1);

end.

uses crt;

const fi='dulieu.txt'

var f1:text;

st:string;

i,d:integer;

begin

clrscr;

assign(f1,fi); rewrite(f1);

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

d:=length(st);

for i:=1 to d do 

if (st[i] in ['A'..Z']) or (st[i] in ['0'..'9']) or (st[i]=#32) then write(f1,st[i]);

close(f1);

end.

#include <bits/stdc++.h>
using namespace std;
int main() {
    string str;
    getline(cin, str);
    string ans = "";
    for (char c : str) {
        if (!isdigit(c)) {
            ans += c;
        }
    }
    cout <<ans;
}

Theo mk là như v

uses crt;

var st:string;

d,i:integer;

begin

clrscr;

readln(st);

d:=length(st);

for i:=1 to d do

if not(st[i] in ['0'..'9']) then write(st[i]);

readln;

end.

 câu 1 Uses Crt;

Var St:String;

dem: Array[‘A’..’Z’] Of Byte

; i:Byte;

ch:Char;

Begin Write(‘Nhap xau St: ‘);

Readln(St);

{Khởi tạo mảng} For ch:=’A’ To ‘Z’ Do dem[ch]:=0;

{Duyệt xâu} For i:=1 To Length(St) Do If Upcase(St[i]) IN [‘A’..’Z’] Then Inc(dem[Upcase(St[i])]);

{Liệt kê các ký tự ra màn hình} For ch:=’A’ To ‘Z’ Do If dem[ch]>0 Then Writeln(ch,’ : ’,dem[ch]);

Readln;

Hehe,con sâu

uses crt;

var st:string;

i,d,kt:integer;

ktu:char;

begin

clrscr;

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

write('Nhap ki tu:'); readln(ktu);

d:=length(st);

kt:=0;

for i:=1 to d do 

  if ktu=st[i] then kt:=1;

if kt=0 then writeln(ktu,' khong co trong xau')

else writeln(ktu,' co trong xau');

readln;

end.

def dem_so_tu(chuoi):

      dem = 0

      tu = chuoi.split()

      for word in tu:

            if word.isalpha():

                  dem += 1

      return dem

chuoi = input("Nhập một chuỗi: ")

so_tu = dem_so_tu(chuoi)

print("Số từ trong chuỗi là:", so_tu)