var a, b, с: integer;
begin
write('Введите два числа: ');
readln(a, b);
if a < b then с := a + 1 else с := b + 1;
repeat с := с - 1
until (a mod с = 0) and (b mod с = 0);
write('NOD = ', с)
end.
//2. Алгоритм с вычитанием (цикл while)
var a, b: integer;
begin
write('a = ');
readln(a);
write('b = ');
readln(b);
while a <> b do
if a > b then
a := a - b
else
b := b - a;
writeln('NOD = ', a);
end.
i,j,d,k:integer;
begin
readln(s);
d:=length(s);
k:=(-1)*d;
for i:=1 to d do
for j:=1 to d do
if s[i]=s[j] then k:=k+1;
if k=0 then writeln('нет') else writeln('есть');
end.