Program HOC24;

var s: string;

tg,d,max,i: byte;

code: integer;

begin

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

// cau a

for i:=1 to length(s) do if s[i] in ['a'..'z'] then write(upcase(s[i]));

//------

writeln;

//-cau b

for i:=length(s) downto 1 do if s[i] in ['0'..'9'] then write(s[i]);

//------

writeln;

//---cau c

d:=0;

for i:= 1 to length(s) do

if s[i] in ['0'..'9'] then 

begin

val(s[i],tg,code);

if tg>max then max:=tg;

d:=d+1;

end;

if d=0 then write('Khong co chu so trong day') else write('Chu so lon nhat la : ',max);

readln 

end.

uses crt;

var st,st1:string;

d,i,d1,max,x,y:integer;

begin

clrscr;

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

d:=length(st);

writeln('Day cac ki tu thuong doi sang chu hoa la: ');

for i:=1 to d do 

  if st[i] in ['a'..'z'] then write(upcase(st[i]):4);

st1:=''

for i:=1 to d do 

  if st[i] in ['0'..'9'] then st1:=st1+st[i];

d1:=length(st1);

for i:=d1 downto 1 do 

  write(st1[i]:4);

writeln;

max:=0;

for i:=1 to d1 do 

  begin

val(st1[i],x,y);

if max<x then max:=x;

end;

writeln('Chu so lon nhat trong xau la: ',max);

readln;

end.

uses crt;

var s,s1,s2:string;

i,d:integer;

begin

clrscr;

readln(s);

s1:=''

s2:=''

d:=length(s);

for i:=1 to d do

  begin

if s[i] in ['0'..'9'] then s1:=s1+s[i];

if (s[i] in ['a'..'z']) or (s[i] in ['A'..'Z']) then s2:=s2+s[i];

end;

writeln('Xau chua cac ki tu so la: ',s1);

writeln('Xau chua cac ki tu chu la: ',s2);

readln;

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.

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;

string st;

int d,i;

int main()

{

getline(cin,st);

d=st.length();

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

if ((st[i]==' ') and (st[i+1]=' ')) st.erase(i,1);

cout<<st;

return 0;

}

uses crt;

var st:string;

i,d:integer;

begin

clrscr;

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

d:=length(st);

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

for i:=1 to d do 

  if st[i] in ['a'..'z'] then upcase(st[i]);

writeln(st);

readln;

end.

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