run error

Please help us to solve the following error. following are the run error in domjudge. 1) Non-zero exitcode 137 runtime: 0.013s cpu, 0.016s wall memory used: 1048576 bytes ********** runguard stderr follows ********** /home/domjudge/domjudge/judgehost/bin/runguard: warning: command terminated with signal 9 2) Non-zero exitcode 1 runtime: 0.022s cpu, 0.024s wall memory used: 3284992 bytes Program error: Traceback (most recent call last): File "rank.py", line 2, in <module> print(int(a)+int(b)+int(c)+(d)) TypeError: unsupported operand type(s) for +: 'int' and 'str' Sunil Kumar UK Deputy manager (Systems) ICTS Amrita Vishwa Vidyapeetham Amritapuri Campus Kerala, India 690525 Phone: 9446671509 [Amrita University]