program t5p4n1;

var a,b,c,d,m,n: longint;

begin

writeln ('vvedit chislo');

readln (n);

writeln ('vvedit zifry yaky treba zaminutu');

readln (a);

writeln ('vvedit zifry na yaky treba zaminutu');

readln (b);

m:=0;

d:=1;

repeat

c:=n mod 10;

if c=a then c:=b;

m:=m+c*d;

d:=d*10;

n:=n div 10;

until n=0;

writeln (m);

readln

end.