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.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


public class Orange {

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String s = br.readLine();
		String res = "";
		int a = Integer.parseInt(br.readLine());
		for (int i=0;i<s.length();i++){
			if ((int)s.charAt(i)<a+97)
				res+=(s.charAt(i)+"").toUpperCase();
			else res+=(s.charAt(i)+"").toLowerCase();
		}
		System.out.println(res);
	}
	
}
