qH
2
 nifzlTLaeWxTD
0
 WlwbRjvrOZakKXqecEdlrCnmvXQtLKBsy
5
 LiqWMLEULRhW
1
 kGqopTbelcDUcoZgnnRYXgPCRQwSLoqeIByFWDI
26
 DuFhhnq
4
 aaaaAaaaaaaAAaaAaaAaAaaaAaaaaaAAaaAAAAAaaAaAAAAaAA
4
 VtQISIHREYaEGPustEkzJRN
20
 aaaaaaAAAaaaaAaaAaaAaaaaAAaAAAaaAAaaaAAaaaaaAaaAAa
2
 uehLuNwrjO
0
 MDJivQRiOIVRcCdkSuUlNbMEOkIVJRMTAnHbkVaOmOblLfignh
25
 isfvbcBEEPaXUDhbVhwddjEutVQqNdlimIKjUnajDQ
2
 BCABcbacbcbAAACCabbaccAabAAaaCCBcBAcCcbaABCCAcCb
4
 IOJRIQefPFxpUj
18
 RvpuYTxsbDiJDOLauRlfatcfwvtnDzKyaewGrZ
22
 fQHHXCdeaintxHWcFcaSGWFvqnYMEByMlSNKumiFgnJB
0
 cdccAAaBBAADdaCDBbDcaDDabdadAbBccCCCDDBADDcdAdC
4
 R
26
 sPWSFWWqZBPon
3
 abcdefabc
3
 SICNEaKsjCnvOEcVqFHLIC
16
 abczxy
0
 sm
26
 fBUycJpfGhsfIVnXAovyoDyndkhv
9
 TtQEIg
24
 vPuebwksPlxuevRLuWcACTBBgVnmcAUsQUficgEAhoEm
9
 GnlFOqPeZtPiBkvvLhaDvGPgFqBTnLgMT
12
 Ik
3
 VWOibsVSFkxPCmyZLWIOxFbfXdlsNzxVcUVf
8
 gfSAltDEjuPqEsOFuiTpcUpCOiENCLbHHnCgvCQtW
13
 fgWjSAlPOvcAbCdDEFjz
7
 pFgLGSkFnGpNKALeDPGlciUNTTlCtAPlFhaIRutCFaFo
24
 cefEDAbedffbaCcEDfEeCEaAcCeFCcEabEecdEdcaFFde
4
 WHbBHzhSNkCZOAOwiKdu
17
 RtsUOGkraqKyjTktAXloOEmQj
18
 LdsmfiNFkPfJgRxytsSJMQZnDTZZ
11
 xedzyPU
13
 bBbAbbbbaaAAAaabbBbaaabBaaaBaBbAaBabaAAAaaaaBabbb
4
 HXyXuYceFtVUMyLqi
21
 tAjlldiqGZUayJZHFQHFJVRukaIKepPVucrkyPtMrhIXoxZbw
12
 EcCEECdCEBaaeCBEBbAaCAeEdeCEedCAdDeEbcACdCcCCd
4
 hQfrRArEPuVAQGfcSuoVKBKvY
22
 jWBVk
17

qh nifzltlaewxtd wlwBrjvrozAkkxqECEDlrCnmvxqtlkBsy liqwmleulrhw KGQOPTBELCDUCOZGNNRYXGPCRQWSLOQEIBYFWDI Dufhhnq AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA vTQISIHREyAEGPuSTEKzJRN AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA uehlunwrjo MDJIVQRIOIVRCCDKSUULNBMEOKIVJRMTANHBKVAOMOBLLFIGNH isfvBcBeepAxudhBvhwddjeutvqqndlimikjunAjdq BCABCBACBCBAAACCABBACCAABAAAACCBCBACCCBAABCCACCB IOJRIQEFPFxPuJ RVPUyTxSBDIJDOLAURLFATCFwVTNDzKyAEwGRz fqhhxcdeaintxhwcfcasgwfvqnymebymlsnkumifgnjb CDCCAAABBAADDACDBBDCADDABDADABBCCCCCDDBADDCDADC R spwsfwwqzBpon ABCdefABC sICNEAKsJCNvOECvqFHLIC abczxy SM FBuyCjpFGHsFIvnxAovyoDynDkHv TTQEIG vpuEBwksplxuEvrluwCACtBBGvnmCAusquFICGEAHoEm GnLFoqpEztpIBKvvLHADvGpGFqBtnLGmt ik vwoiBsvsFkxpCmyzlwioxFBFxDlsnzxvCuvF GFsALtDEJupqEsoFuItpCupCoIEnCLBHHnCGvCqtw FGwjsAlpovCABCDDEFjz PFGLGSKFNGPNKALEDPGLCIUNTTLCTAPLFHAIRUTCFAFO CefeDABeDffBACCeDfeeCeAACCefCCeABeeCDeDCAffDe wHBBHzHsNKCzOAOwIKDu RtsuOGKRAQKyJtKtAxLOOEMQJ lDsmFInFKpFJGrxytssJmqznDtzz xEDzypu BBBABBBBAAAAAAABBBBAAABBAAABABBAABABAAAAAAAABABBB HxyxUyCEFTvUMyLQI tAJLLDIqGzuAyJzHFqHFJvruKAIKEppvuCrKyptmrHIxoxzBw eCCeeCDCeBAAeCBeBBAACAeeDeCeeDCADDeeBCACDCCCCD HQFRRAREPUVAQGFCSUOVKBKVy JwBvK
import java.io.*;
public class Main {

    public static void main(String[] args) {
       BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        try{
            String s = br.readLine();
            int n = Integer.parseInt(br.readLine());
            s = s.toLowerCase();
            String ans = "";
            for(int i = 0; i < s.length(); ++i)
            {
                char c = s.charAt(i);
                if(c < n + 97)
                {
                  ans = ans + Character.toUpperCase(c);
                }
                else{
                    ans = ans + Character.toLowerCase(c);
                }
            }
            System.out.println(ans);
        }
        catch(Exception e){

        }
    }
}
