s=input()
key=input()
s= s.lower()
p=[]
mw=[]
for i in range(len(s)):
    if 'a'<=s[i]<='z' or '0'<=s[i]<='9':
        p+=[i]
for i in range(0,len(p),len(key)):
    for j in range(key):
        if'a'<=s[p[i+j]]<='z':
            mw+=chr((ord(s[i])-ord('a')+int(key[j]))%26+1+ord('a'))
        else:
            mw+=chr((ord(s[i])-ord('0')+int(key[j]))%10+1+ord('0'))
mw=mw+s[-1]