Προβλημα περιοδου

Question

&Gamma;&epsilon;&iota;&alpha; &sigma;&alpha;&sigmaf; &epsilon;&iota;&mu;&alpha;&iota; 29 &chi;&rho;&omicron;&nu;&omega;&nu; &epsilon;&chi;&omega; &pi;&rho;&omicron;&beta;&lambda;&eta;&mu;&alpha; &mu;&epsilon; &pi;&omicron;&lambda;&upsilon;&kappa;&iota;&sigma;&tau;&iota;&kappa;&epsilon;&sigmaf; &omega;&omicron;&theta;&eta;&kappa;&epsilon;&sigmaf;  &epsilon;&lambda;&alpha;&phi;&rho;&omega;&sigmaf; &upsilon;&psi;&eta;&lambda;&eta; &pi;&rho;&omicron;&lambda;&alpha;&kappa;&tau;&iota;&nu;&eta; 29 &kappa;&alpha;&iota; &pi;&omicron;&lambda;&upsilon; &alpha;&sigma;&tau;&alpha;&tau;&eta; &pi;&epsilon;&rho;&iota;&omicron;&delta;&omicron;.&lambda;&omicron;&gamma;&omega; 17 &eta;&mu;&epsilon;&rho;&omega;&nu; &kappa;&alpha;&theta;&upsilon;&sigma;&tau;&epsilon;&rho;&eta;&sigma;&eta;&sigmaf; &pi;&eta;&rho;&alpha; &pi;&rho;&iota;&mu;&omicron;&lambda;&omicron;&upsilon;&tau; &delta;&upsilon;&omicron; &mu;&alpha;&zeta;&iota; &gamma;&iota;&alpha; &pi;&epsilon;&nu;&tau;&epsilon; &mu;&epsilon;&rho;&epsilon;&sigmaf;. &Alpha;&delta;&iota;&alpha;&theta;&epsilon;&tau;&eta;&sigma;&alpha; &mu;&omicron;&upsilon; &kappa;&rho;&alpha;&tau;&eta;&sigma;&epsilon; 14 &mu;&epsilon;&rho;&epsilon;&sigmaf; &eta; &pi;&epsilon;&rho;&iota;&omicron;&delta;&omicron; &kappa;&alpha;&iota; &mu;&epsilon;&tau;&alpha; &alpha;&pi;&omicron; &tau;&rho;&epsilon;&iota;&sigmaf; &mu;&epsilon;&rho;&epsilon;&sigmaf; &mu;&omicron;&upsilon; &xi;&alpha;&nu;&alpha;&eta;&rho;&theta;&epsilon; &kappa;&alpha;&iota; &alpha;&pi;&omicron; &tau;&omicron;&tau;&epsilon; &epsilon;&chi;&omega; &epsilon;&delta;&omega; &kappa;&alpha;&iota; 15 &mu;&epsilon;&rho;&epsilon;&sigmaf; &mu;&iota;&alpha; &sigma;&upsilon;&nu;&epsilon;&chi;&omicron;&mu;&epsilon;&nu;&eta; &alpha;&lambda;&lambda;&alpha; &pi;&omicron;&lambda;&upsilon; &epsilon;&lambda;&alpha;&phi;&rho;&iota;&alpha; &pi;&epsilon;&rho;&iota;&omicron;&delta;&omicron; &mu;&epsilon; &epsilon;&nu;&alpha;&lambda;&alpha;&gamma;&epsilon;&sigmaf; &kappa;&alpha;&phi;&epsilon; &kappa;&alpha;&iota; &rho;&omicron;&zeta; &alpha;&iota;&mu;&alpha;. &Pi;&omega;&sigmaf; &mu;&pi;&omicron;&rho;&omega; &nu;&alpha; &sigma;&tau;&alpha;&mu;&alpha;&tau;&eta;&sigma;&omega; &alpha;&upsilon;&tau;&eta; &tau;&eta; &delta;&iota;&alpha;&tau;&alpha;&rho;&alpha;&chi;&eta;; &phi;&tau;&alpha;&iota;&nu;&epsilon; &omicron;&iota; &pi;&omicron;&lambda;&upsilon;&kappa;&iota;&sigma;&tau;&iota;&kappa;&epsilon;&sigmaf; &tau;&omicron; &pi;&rho;&iota;&mu;&omicron;&lambda;&omicron;&upsilon;&tau;;; &epsilon;&upsilon;&chi;&alpha;&rho;&iota;&sigma;&tau;&omega; &pi;&omicron;&lambda;&upsilon; &pi;&epsilon;&rho;&iota;&mu;&epsilon;&nu;&omega; &epsilon;&nu;&alpha;&gamma;&omega;&nu;&iota;&omega;&sigmaf; &tau;&eta;&nu; &alpha;&pi;&alpha;&nu;&tau;&eta;&sigma;&eta; &sigma;&alpha;&sigmaf;