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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 d,i,d1;
string st;
int main()
{
getline(cin,st);
d=st.length();
while (st[0]==32)
{
st.erase(0,1);
}
while (st[d-1]==32)
{
st.erase(d-1,1);
}
d1=st.length();
for (i=0; i<d1; i++)
if ((st[i]==32) && st[i+1]==32)
{
st.erase(i,1);
i--;
}
cout<<st;
return 0;
}
uses crt;
var st:string;
i,d:integer;
begin
clrscr;
readln(st);
d:=length(st);
for i:=1 to d do
if (st[i]='a') or (st[i]='A') then st[i]:='b';
writeln(st);
readln;
end.
Uses crt;
Var st:string;
I,d:integer;
Begin
Clrscr;
Write('nhap xau:'); readln(st);
D:=length(st);
While st[d]=#32 do
Begin
Delete(st,d,1);
D:=length(st);
End;
For i:=1 to d do
If (st[i]=#32) and (st[i+1]=#32) then delete(st,i,1);
Writeln(st);
Readln;
End.
Uses crt;
Var st:string;
I,d:integer;
Begin
Clrscr;
Write('nhap xau:'); readln(st);
D:=length(st);
While st[d]=#32 do
Begin
Delete(st,d,1);
D:=length(st);
End;
For i:=1 to d do
If (st[i]=#32) and (st[i+1]=#32) then delete(st,i,1);
Writeln(st);
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.