Решение задачи String 28

#include <bits/stdc++.h>

using namespace std;

int main()
{
    char c;
    string s;
    cin >> c >> s;
    int pos = s.find(c);
    while(pos + 1){
        s.insert(pos, 1, c);
        pos = s.find(c, pos + 2);
    }
    cout << s;
    return 0;
}

# -*- coding: utf-8 -*-
import random

ru_letters = u"абвгдежзийклмнопрстуфхцчшщъыьэюяАБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯ"
en_letters = u"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
tj_letters = u"ғӣқӯҳҷҒӢҚӮҲҶ"
digits = u"0123456789"

letters = ru_letters + en_letters + tj_letters + digits

K = random.randrange(1,21)
S = ''.join(random.choice(letters) for _ in range(K))
C = random.choice(S)

print("K:",K)
print("String:",S)
print("Character: ",C)

S_new = ""
for i in S:
    if i == C:
        S_new += i
    S_new += i
print("New string:",S_new)
									

program String28;
var
 S:string;
 C:Char;
 i:integer;
 
begin
 Write('C:');
 Readln(C);
 Write('S:');
 Readln(S);
 i:=0;
 While(i<=length(S)) do
  begin
   if S[i] = C then
    begin
     Insert(C,S,i);
     inc(i);
    end;
   inc(i);
  end;
 
 writeln(S);
end.