Hi I am having the same issue, can anyone help me?

t=int(input())
tasks=[]
output=[]
for i in range(t):
    n=int(input())
    for j in range(n):
        tasks.append(input().split(" "))
    for j in range(n):
        for k in range(2):
            tasks[j][k]=int(tasks[j][k])
    a=lambda task:task[0]
    tasks.sort(key=a,reverse= False)
    D={"C":"F","J":"F"}
    cEndTask=0
    jEndTask=0
    o=""
    flag=0
    for j in range(n):
        if(tasks[j][0]>=cEndTask):
            D["C"]="F"
        if(D["C"]=="F" and cEndTask<=tasks[j][0]):
            D["C"]="B"
            cEndTask=tasks[j][1]
            o+="C"
            flag+=1
            continue
        if(tasks[j][0]>=jEndTask):
            D["J"]="F"
        if(D["C"]=="B" and jEndTask<=tasks[j][0]):
            D["J"]="B"
            jEndTask=tasks[j][1]
            o+="J"
            flag+=1
            continue
    tasks=[]
    if(flag!=n):
        o = "IMPOSSIBLE"
    output.append(o)
for i in range(t):
    print("Case #"+str(i+1)+": "+output[i])

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