B'Innokentiy likes tea very much and today he wants to drink exactly n cups of tea. He would be happy to drink more but he had exactly n tea bags, a of them are green and b are black. Innokentiy doesn 't like to drink the same tea (green or black) more than k times in a row. Your task is to determine the order of brewing tea bags so that Innokentiy will be able to drink n cups of tea, without drinking the same tea more than k times in a row, or to inform that it is impossible. Each tea bag has to be used exactly once. The first line contains four integers n, k, a and b (1 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89k xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89n xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89105, 0 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89a, xe2 x80 x89b xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89n) -- the number of cups of tea Innokentiy wants to drink, the maximum number of cups of same tea he can drink in a row, the number of tea bags of green and black tea. It is guaranteed that a xe2 x80 x89+ xe2 x80 x89b xe2 x80 x89= xe2 x80 x89n. If it is impossible to drink n cups of tea, print "NO" (without quotes). Otherwise, print the string of the length n, which consists of characters 'G ' and 'B '. If some character equals 'G ', then the corresponding cup of tea should be green. If some character equals 'B ', then the corresponding cup of tea should be black. If there are multiple answers, print any of them. '...