$$(-103)-(-15)-(-16)-(-121=$$
$49$
$$-103+15-\left(-16\right)-\left(-121\right)$$
$$-88-\left(-16\right)-\left(-121\right)$$
$$-88+16-\left(-121\right)$$
$$-72-\left(-121\right)$$
$$-72+121$$
$$49$$
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$7^{2}$