def n_char(n,fill_char='0'):
    return fill_char * n

def rjust(s, width, fill_char=' '):
     length = len(s)
     if length < width:
         n = width - length
         r = n_char(n,fill_char) + s
        return r
     else:
        return s
s = input()
width = int(input())
fillchar = input()
print(rjust(s, width, fillchar))