Chinese remainder theorem by tails

main(a,b,m,n){for(;~scanf("%d%d%d%d",&a,&b,&m,&n);vprintf("%d\n"))for(;a>m*n?a=-1,0:a%n-b;a+=m);}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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