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int tasks = 23;
int num = 4;
int avg = (int)Math.ceil((double) tasks / (double) num);
int mod = tasks - (avg * (num - 1));
StringBuilder str = new StringBuilder();
for (int i = 0; i < num - 1; i++) {
str.append(avg).append("-");
}
str.append(mod);
System.out.println(str);