{"trustable":true,"sections":[{"title":"","value":{"format":"MD","content":"I have an Ifter party at the **5\u003csup\u003eth\u003c/sup\u003e** day of Ramadan for the contestants. For this reason I have invited **C** contestants and arranged **P** piaju\u0027s (some kind of food, specially mader for Ifter). Each contestant ate **Q** piaju\u0027s and **L** piaju\u0027s were left **(L \u0026lt; Q)**.\n\nNow you have to find the number of piaju\u0027s each contestant ate.\n"}},{"title":"Input","value":{"format":"MD","content":"Input starts with an integer **T (\u0026#8804; 325)** denoting the number of test cases.\n\nEach case contains two non-negative integers **P** and **L (0 \u0026#8804; L \u0026lt; P \u0026lt; 2\u003csup\u003e31\u003c/sup\u003e)**.\n"}},{"title":"Output","value":{"format":"MD","content":"For each case, print the case number and the number of possible integers in ascending order. If no such integer is found print `impossible`.\n"}},{"title":"Sample","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e4\n10 0\n13 2\n300 98\n1000 997\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003eCase 1: 1 2 5 10\nCase 2: 11\nCase 3: 101 202\nCase 4: impossible\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}}]}