import sys

sys.setrecursionlimit(10 ** 5)
int1 = lambda x: int(x) - 1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.readline())
def MI(): return map(int, sys.stdin.readline().split())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def SI(): return sys.stdin.readline()[:-1]

def extgcd(a,b,c):
    if b==0:return c//a,0,abs(a)
    x,y,g=extgcd(b,a%b,c)
    return y,x-y*(a//b),g

def main():
    mx=10000
    x,y,z=MI()
    cx,cy,g=extgcd(x,y,z)
    if z%g:
        print("NO")
        exit()
    p=(cx>0)*2-1
    while (abs(cx)+abs(cy))*2-1>mx and (cx>0)*2-1==p:
        cx,cy=cx-p*y,cy+p*x
    if (abs(cx)+abs(cy))*2-1>mx:
        print("NO")
        exit()
    if cx>0:ans="w"*abs(cy)+"c"*cx+"C"*(cx-1)+("C" if cy>0 else "W")*abs(cy)
    else:ans="c"*abs(cx)+"w"*cy+"C"*(cy-1)+("C" if cx>0 else "W")*abs(cx)
    print(ans)

main()